2021 GMC Sierra 3500 HD Maintenance
Get Started
Get Top-Notch GMC Sierra 3500 HD Maintenance Service
Take care of your GMC Sierra 3500 HD and it'll take care of you. Schedule an appointment for routine maintenance today.
2021 GMC Sierra 3500 HD Maintenance Schedule
What is the manufacturer recommended maintenance schedule for a 2021 GMC Sierra 3500 HD? Find maintenance info for your vehicle.
7,500 Miles
Maintenance check at 7500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
15,000 Miles
Maintenance check at 15000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
30,000 Miles
Maintenance check at 30000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Air Cleaner Element
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
37,500 Miles
Maintenance check at 37500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
45,000 Miles
Maintenance check at 45000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Transfer Case Fluid
- REPLACE Fuel Filter
- RESET Oil Life Monitor
- ROTATE Tires
52,500 Miles
Maintenance check at 52500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
60,000 Miles
Maintenance check at 60000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
67,500 Miles
Maintenance check at 67500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
75,000 Miles
Maintenance check at 75000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Leakage
- LUBRICATE Body Components
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
82,500 Miles
Maintenance check at 82500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
90,000 Miles
Maintenance check at 90000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
97,500 Miles
Maintenance check at 97500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Spark Plug Wires
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Spark Plugs
- ROTATE Tires
- RESET Oil Life Monitor
105,000 Miles
Maintenance check at 105000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
112,500 Miles
Maintenance check at 112500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
120,000 Miles
Maintenance check at 120000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
127,500 Miles
Maintenance check at 127500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Starter Safety Switch
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
135,000 Miles
Maintenance check at 135000 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
142,500 Miles
Maintenance check at 142500 miles for your 2021 GMC Sierra 3500 HD Base
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
150,000 Miles
Maintenance check at 150000 miles for your 2021 GMC Sierra 3500 HD Base
- DRAIN & REFILL Engine Coolant
- INSPECT Accelerator Pedal
- INSPECT Accessory Drive Belt
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Automatic Transmission Filter
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
7,500 Miles
Maintenance check at 7500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
15,000 Miles
Maintenance check at 15000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- RESET Oil Life Monitor
- ROTATE Tires
- LUBRICATE Body Components
30,000 Miles
Maintenance check at 30000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
37,500 Miles
Maintenance check at 37500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
45,000 Miles
Maintenance check at 45000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- REPLACE Air Cleaner/Element
- RESET Oil Life Monitor
- ROTATE Tires
52,500 Miles
Maintenance check at 52500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
60,000 Miles
Maintenance check at 60000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
67,500 Miles
Maintenance check at 67500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
75,000 Miles
Maintenance check at 75000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Exhaust System & Heat Shields
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
82,500 Miles
Maintenance check at 82500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
90,000 Miles
Maintenance check at 90000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
97,500 Miles
Maintenance check at 97500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Air Cleaner Element
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Spark Plug Wires
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Spark Plugs
- RESET Oil Life Monitor
- ROTATE Tires
105,000 Miles
Maintenance check at 105000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
112,500 Miles
Maintenance check at 112500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
120,000 Miles
Maintenance check at 120000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Sunroof Rails
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
127,500 Miles
Maintenance check at 127500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
135,000 Miles
Maintenance check at 135000 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
142,500 Miles
Maintenance check at 142500 miles for your 2021 GMC Sierra 3500 HD Denali
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
150,000 Miles
Maintenance check at 150000 miles for your 2021 GMC Sierra 3500 HD Denali
- DRAIN & REFILL Engine Coolant
- INSPECT Accelerator Pedal
- INSPECT Accessory Drive Belt
- INSPECT Air Cleaner Element
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Automatic Transmission Filter
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
7,500 Miles
Maintenance check at 7500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Fuel System
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
15,000 Miles
Maintenance check at 15000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
30,000 Miles
Maintenance check at 30000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Starter Safety Switch
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
37,500 Miles
Maintenance check at 37500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
45,000 Miles
Maintenance check at 45000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
52,500 Miles
Maintenance check at 52500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Gas Strut
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
60,000 Miles
Maintenance check at 60000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
67,500 Miles
Maintenance check at 67500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
75,000 Miles
Maintenance check at 75000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
82,500 Miles
Maintenance check at 82500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Accelerator Pedal
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
90,000 Miles
Maintenance check at 90000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
97,500 Miles
Maintenance check at 97500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Spark Plug Wires
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Wiper Blades
- INSPECT Window Washer Fluid Level
- LUBRICATE Body Components
- REPLACE Spark Plugs
- RESET Oil Life Monitor
- ROTATE Tires
105,000 Miles
Maintenance check at 105000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
112,500 Miles
Maintenance check at 112500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
120,000 Miles
Maintenance check at 120000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
127,500 Miles
Maintenance check at 127500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Ignition Transaxle Lock
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
135,000 Miles
Maintenance check at 135000 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
142,500 Miles
Maintenance check at 142500 miles for your 2021 GMC Sierra 3500 HD SLT
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
150,000 Miles
Maintenance check at 150000 miles for your 2021 GMC Sierra 3500 HD SLT
- DRAIN & REFILL Engine Coolant
- INSPECT Accelerator Pedal
- INSPECT Accessory Drive Belt
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- REPLACE Automatic Transmission Filter
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
- LUBRICATE Body Components
7,500 Miles
Maintenance check at 7500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
15,000 Miles
Maintenance check at 15000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
30,000 Miles
Maintenance check at 30000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
37,500 Miles
Maintenance check at 37500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
45,000 Miles
Maintenance check at 45000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
52,500 Miles
Maintenance check at 52500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
60,000 Miles
Maintenance check at 60000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Fuel System
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
67,500 Miles
Maintenance check at 67500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
75,000 Miles
Maintenance check at 75000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
82,500 Miles
Maintenance check at 82500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
90,000 Miles
Maintenance check at 90000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
97,500 Miles
Maintenance check at 97500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Spark Plug Wires
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Spark Plugs
- RESET Oil Life Monitor
- ROTATE Tires
105,000 Miles
Maintenance check at 105000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Sunroof Rails
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
112,500 Miles
Maintenance check at 112500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
120,000 Miles
Maintenance check at 120000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
127,500 Miles
Maintenance check at 127500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
135,000 Miles
Maintenance check at 135000 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Gas Strut
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
142,500 Miles
Maintenance check at 142500 miles for your 2021 GMC Sierra 3500 HD SLE
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
150,000 Miles
Maintenance check at 150000 miles for your 2021 GMC Sierra 3500 HD SLE
- DRAIN & REFILL Engine Coolant
- INSPECT Accelerator Pedal
- INSPECT Accessory Drive Belt
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Automatic Transmission Filter
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
7,500 Miles
Maintenance check at 7500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
15,000 Miles
Maintenance check at 15000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Wiper Blades
- INSPECT Window Washer Fluid Level
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
30,000 Miles
Maintenance check at 30000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
37,500 Miles
Maintenance check at 37500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
45,000 Miles
Maintenance check at 45000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
52,500 Miles
Maintenance check at 52500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
60,000 Miles
Maintenance check at 60000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
67,500 Miles
Maintenance check at 67500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
75,000 Miles
Maintenance check at 75000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
82,500 Miles
Maintenance check at 82500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
90,000 Miles
Maintenance check at 90000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- INSPECT Ignition Transaxle Lock
- LUBRICATE Body Components
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
97,500 Miles
Maintenance check at 97500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Spark Plug Wires
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Spark Plugs
- RESET Oil Life Monitor
- ROTATE Tires
105,000 Miles
Maintenance check at 105000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
112,500 Miles
Maintenance check at 112500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Transfer Case Fluid
- REPLACE Fuel Filter
- RESET Oil Life Monitor
- ROTATE Tires
120,000 Miles
Maintenance check at 120000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
127,500 Miles
Maintenance check at 127500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
135,000 Miles
Maintenance check at 135000 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Evap Emission Control System
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- REPLACE Air Cleaner/Element
- REPLACE Automatic Transmission Filter
- REPLACE Automatic Transmission Fluid
- REPLACE Cabin Air Filter
- REPLACE Fuel Filter
- REPLACE Transfer Case Fluid
- RESET Oil Life Monitor
- ROTATE Tires
- LUBRICATE Body Components
142,500 Miles
Maintenance check at 142500 miles for your 2021 GMC Sierra 3500 HD AT4
- INSPECT Accelerator Pedal
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- RESET Oil Life Monitor
- ROTATE Tires
150,000 Miles
Maintenance check at 150000 miles for your 2021 GMC Sierra 3500 HD AT4
- DRAIN & REFILL Engine Coolant
- INSPECT Accelerator Pedal
- INSPECT Accessory Drive Belt
- INSPECT Air Cleaner Element
- INSPECT Automatic Shiftlock And Park/Neutral Switch
- INSPECT Brake System
- INSPECT Engine Coolant
- INSPECT Engine Oil & Filter
- INSPECT Exhaust System & Heat Shields
- INSPECT Fuel System
- INSPECT Gas Strut
- INSPECT Ignition Transaxle Lock
- INSPECT Leakage
- INSPECT Parking Brake
- INSPECT Restraint System Components
- INSPECT Starter Safety Switch
- INSPECT Sunroof Rails
- INSPECT Suspension & Steering Components
- INSPECT Window Washer Fluid Level
- INSPECT Wiper Blades
- LUBRICATE Body Components
- REPLACE Automatic Transmission Filter
- REPLACE Hood Support Gas Strut
- RESET Oil Life Monitor
- ROTATE Tires
2021 GMC Sierra 3500 HD Maintenance Schedule
What is the recommended maintenance schedule for the 2021 GMC Sierra 3500 HD?
Here’s Why 2021 GMC Sierra 3500 HD Scheduled Maintenance Matters
You want your GMC Sierra 3500 HD to last as long as possible. With the right maintenance at the right time, you could hit 200,000 miles (or beyond!) in your Sierra 3500 HD. So, you want to care for your car, but you’re not sure when to get certain services. It can be overwhelming, but fortunately, there’s a resource that takes the guesswork out of routine Sierra 3500 HD maintenance. Just follow your 2021 GMC Sierra 3500 HD maintenance schedule!
The recommended maintenance schedule is put together by GMC, your vehicle manufacturer. Scheduled maintenance services can vary depending on driving conditions, climate, and other factors; in most cases, though, recommended maintenance will consist of services like oil changes, tire rotations, brake pad replacement, filter changes, and fluid checks and exchanges. Keeping up with routine service appointments is a great way to keep your Sierra 3500 HD running for longer, increase your vehicle safety, and help you avoid expensive repairs caused by 2021 GMC Sierra 3500 HD problems later.
Essential Maintenance to Keep Your GMC Sierra 3500 HD Running Newer, Longer
Bring your 2021 GMC Sierra 3500 HD to Firestone Complete Auto Care for factory-recommended maintenance services and our technicians will jump right in with a Courtesy Check. A Courtesy Check helps "set the stage" for your service and catch any small problems before they turn into big repairs. Each Courtesy Check includes a free battery test and an inspection of your Sierra 3500 HD's windshield wiper blades, head and tail lights, filters, fluid levels, tires, and alignment.
Think you could be due for a new battery in your 2021 GMC Sierra 3500 HD? Batteries generally need to be replaced every three to five years. Yours may need to be replaced sooner depending on your driving habits and climate. Extremely hot or cold temperatures can take a toll on your GMC Sierra 3500 HD battery, and so can frequent short drives. While you could wait until your battery fails and you hear the dreaded "click," you're better off replacing it before then! Otherwise, you may find yourself (and your trusty Sierra 3500 HD) stuck in the middle of nowhere. Your GMC Sierra 3500 HD won't be going anywhere without a strong battery.
In addition to maintaining a strong battery, investing in regular oil changes can help your 2021 GMC Sierra 3500 HD's engine run smoother. Reference the chart toward the top of the page if you're not sure about the optimal oil change intervals for your 2021 Sierra 3500 HD. Remember, things like average outside temperature or frequency of trips could increase or decrease this interval for your specific vehicle. Talk to a Firestone Complete Auto Care technician to know when to change your oil. Not sure what type of oil to use for your 2021 GMC Sierra 3500 HD? We can help with that, too!
Periodic service to the steering system in your GMC Sierra 3500 HD can not only ensure a smooth ride; it can also help you maintain control of your car in compromised road conditions. When it comes to steering and suspension, you want to catch small problems before they turn into big (and expensive) ones. You can count on Firestone Complete Auto Care’s trained technicians to inspect this system and, if needed, perform GMC Sierra 3500 HD suspension and steering services. These might include wheel alignment, power steering fluid flushes and replenishments, ball joint lubrication, wheel bearing replacement, and strut replacement. Prevent damage or premature wear and tear on your GMC Sierra 3500 HD's steering system with regular maintenance.
If you fall behind on routine GMC Sierra 3500 HD maintenance (or worse, don’t do it at all!), you could be feeling the heat on the road – literally! A malfunctioning A/C system or overheating engine can wreak havoc on your car. Our technicians have you covered there, too, with the tools and expertise to care for your entire GMC Sierra 3500 HD cooling, heating, and climate control system. Need a new GMC Sierra 3500 HD radiator? We can take care of that. Got a funny smell coming from your A/C? We’re here to fix that, too. Firestone Complete Auto Care is the place to go for 2021 GMC Sierra 3500 HD maintenance.
So visit us regularly, or visit us urgently. Many locations are open on weekends and in the evening.
Want to know the secrets to maintaining your 2021 GMC Sierra 3500 HD? Read on for answers to common maintenance questions!
Take an active role in maintaining your 2021 GMC Sierra 3500 HD. Get answers to common GMC Sierra 3500 HD maintenance questions and learn more about caring for your vehicle.
-
What do I do if I hit a pothole in my GMC Sierra 3500 HD? Watch out for pothole damage. If your 2021 Sierra 3500 HD is pulling to one side or the other, your tires or suspension system could be calling out for help.
-
When does my GMC Sierra 3500 HD need high mileage oil? If your GMC Sierra 3500 HD has ticked past 75,000 miles, consider switching to high mileage oil at your next oil change to give your engine what it needs to go another 75,000 (or more!). High mileage oil: make it a high priority!
-
Can GMC dashboard warning lights wait? It's better to get them addressed as soon as possible. An illuminated dashboard light means something in your vehicle isn't functioning like it should. Letting problems linger can mean bad news for your GMC Sierra 3500 HD, so be sure to take your car in for service as soon as you notice an illuminated dashboard light