Why does my Sierra 3500 HD’s check engine light come on when I start it?

It's okay if your check engine light comes on when you first start your vehicle. It’s just your Sierra 3500 HD firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.

Are GMC Sierra 3500 HD engine noises bad?

Unusual noises can signal a problem with your GMC Sierra 3500 HD engine. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.

What could damage my GMC Sierra 3500 HD engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.

Can I put water in my GMC Sierra 3500 HD radiator?

An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your Sierra 3500 HD when you’re out of coolant, having water in the coolant reservoir is better than nothing.

What could cause my Sierra 3500 HD engine to suddenly stop?

There are different reasons your Sierra 3500 HD vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.

Who fixes GMC Sierra 3500 HD engines?

Your local Firestone Complete Auto Care offers GMC Sierra 3500 HD engine repair. Schedule an appointment today at one of our thousands of locations nationwide!

Engine Repairs for Your 2012 GMC Sierra 3500 HD

Learn about

2012 GMC Sierra 3500 HD Trim Options

Select your GMC Sierra 3500 HD trim level to learn more about GMC-recommended engine repair. Even GMC Sierra 3500 HD parts will get older and change.

V8/6.0L

V8/6.6L

Repairs for Your 2012 GMC Sierra 3500 HD

Nothing stays the same forever. Even your GMC Sierra 3500 HD's many parts and pieces. We’re here to help when something stops working. Click on a repair below to learn more about 2012 GMC Sierra 3500 HD repairs.

We’re Trained to Care for GMC Sierra 3500 HD Engines

GMC Sierra 3500 HD drivers trust that their Sierra 3500 HD will take them near and far. You probably thought about that when you got it. However, even your trustworthy engine is subject to wear and tear. Things can go wrong on the road. If the unexpected strikes, you may search the internet frantically for quick and affordable 2012 GMC Sierra 3500 HD engine repairs. Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. We've serviced more than 500 million vehicles since 1926, and our technicians know GMC Sierra 3500 HD engines. Schedule a courtesy inspection at the first sign of engine trouble. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

Illuminated Check Engine Light on 2012 GMC Sierra 3500 HD

An illuminated check engine light on your GMC Sierra 3500 HD is one of the first signs it's time to 'brake' for engine service. A steady or flashing check engine light could signal a serious issue with your car’s ignition, Possible causes can include a failing oxygen sensor, worn spark plug, a problem with your catalytic converter, or an engine vacuum leak, to name a few possible causes. Bring your Sierra 3500 HD in for an on-board diagnostic check and we’ll figure out why that check engine light is giving you grief. Other signs your GMC Sierra 3500 HD engine needs some TLC are oil leaks, or misfiring.

GMC Sierra 3500 HD Engine Repair

If your 2012 Sierra 3500 HD engine needs repairs, our technicians will make sure you understand what’s going on before they start working on your engine. We make recommendations, but you make the final decision. If a service can wait, we’ll make sure you know. If it's necessary for your safety, we'll make sure you understand that, too. We want to provide you with the information you need to make an informed engine repair decision. By choosing Firestone Complete Auto Care for Sierra 3500 HD engine repairs and you can feel confident knowing that we use GMC-approved parts and components like the timing belt, valve guide seal, fuses, or other parts.

Engine Q&A 2012 GMC Sierra 3500 HD

Why does my Sierra 3500 HD’s check engine light come on when I start it? It's okay if your check engine light comes on when you first start your vehicle. It’s just your Sierra 3500 HD firing up its circuits. The light should go off shortly. Bring your vehicle in if it doesn't.
Are GMC Sierra 3500 HD engine noises bad? Unusual noises can signal a problem with your GMC Sierra 3500 HD engine. Tapping or knocking could mean you're low on oil. A high-pitched whistle could signal an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding could be a sign that something is wrong with your brakes — not the engine.
What could damage my GMC Sierra 3500 HD engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, flooring the gas pedal while the car is in Park, or accelerating too quickly, too soon. Protect your engine’s performance and efficiency by distancing yourself from these habits.
Can I put water in my GMC Sierra 3500 HD radiator? An emergency is the only time you should consider putting water in your radiator. Outside of that, it’s recommended you use a pre-mixed coolant or a 50/50 blend of water and coolant. However, if you need to continue driving your Sierra 3500 HD when you’re out of coolant, having water in the coolant reservoir is better than nothing.
What could cause my Sierra 3500 HD engine to suddenly stop? There are different reasons your Sierra 3500 HD vehicle engine could suddenly stop. You may be looking at a lack of fuel, faulty sensors, issues with the ignition system, engine overheating, electrical problems, or mechanical troubles.
Who fixes GMC Sierra 3500 HD engines? Your local Firestone Complete Auto Care offers GMC Sierra 3500 HD engine repair. Schedule an appointment today at one of our thousands of locations nationwide!