Why does my Sierra 2500’s check engine light come on when I start it?

Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your Sierra 2500 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Are GMC Sierra 2500 engine noises bad?

Strange under-the-hood noises can point to problems within your GMC Sierra 2500 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 2500 engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or accelerating too quickly, too soon. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.

Can I add water to my GMC Sierra 2500 radiator?

It’s not recommended you put water in your Sierra 2500 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.

What can cause a Sierra 2500 engine to suddenly stop?

Your Sierra 2500 car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.

Who can repair my GMC Sierra 2500 engine?

Your local Firestone Complete Auto Care fixes GMC Sierra 2500 engines. Book an appointment today! We have thousands of locations across the country.

Engine Repairs for Your 1999 GMC Sierra 2500

Learn about

1999 GMC Sierra 2500 Trim Options

Select your GMC Sierra 2500 trim level to learn more about GMC-recommended engine repair. Even GMC Sierra 2500 parts will get older and change.

V8/5.3L

V8/6.0L

1999 GMC Sierra 2500 Repair

Nothing stays the same forever. Even your GMC Sierra 2500’s engine parts and components will change. When something breaks or fails, we’re ready to help. Select a service or repair below to learn more about what we can do for your 1999 GMC Sierra 2500.

We Know GMC Sierra 2500 Engines

The GMC Sierra 2500 is respected for its reliability. You may have even been thinking about that when you bought it. However, the wear-proof engine has yet to be invented! Things can go sideways sometimes. If they do, you’ll have to find a dependable 1999 GMC service center — quick! Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. Since 1926, we’ve taken care of 500 million+ cars, so you can rest assured knowing your GMC Sierra 2500 engine will be in good hands. 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.

Check Engine Light on 1999 GMC Sierra 2500

If your Sierra 2500 check engine light is on, it’s time to get it looked at. A check engine light that’s flashing or steadily illuminated could point to problems with your vehicle's ignition, Potential causes may include a faulty oxygen sensor, bad spark plug, issues with your catalytic converter, or an engine vacuum leak, to name a few potential sources. Stop by your local Firestone Complete Auto Care to get your Sierra 2500 issues diagnosed and our expert techs will get the root of the problem. rattling sounds, essential fluid leaks, or misfiring.

1999 Sierra 2500 Engine Services

When your GMC Sierra 2500 engine needs repairs, our expert techs will let you know what needs to be done and why before they get started. We don't start working until we have your approval. If a repair can wait, we'll let you know. If it's necessary for your safety, we'll make sure you understand that, too. We want to give you all the details you need to make an informed decision about your engine repairs. Turn to Firestone Complete Auto Care for your 1999 Sierra 2500 engine repairs and you can drive easy knowing that we use GMC-approved parts and fluids — cambelt, oil gasket, sensors, or a different component.

1999 GMC Sierra 2500 Engine Q&A

Why does my Sierra 2500’s check engine light come on when I start it? Generally, your check engine light turning on upon ignition is not a bad thing. It’s just your Sierra 2500 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Are GMC Sierra 2500 engine noises bad? Strange under-the-hood noises can point to problems within your GMC Sierra 2500 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 2500 engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or accelerating too quickly, too soon. Help sustain your engine’s performance and efficiency by staying miles away from these bad driving practices.
Can I add water to my GMC Sierra 2500 radiator? It’s not recommended you put water in your Sierra 2500 radiator unless it’s an emergency. Under normal circumstances, use a 50/50 mix of water and coolant or a pre-mixed coolant. But, if you need to keep driving while out of coolant, using water is better than driving with an empty coolant reservoir.
What can cause a Sierra 2500 engine to suddenly stop? Your Sierra 2500 car engine could stop suddenly due to low fuel, electrical issues, overheating, a faulty ignition system, mechanical troubles, or sensor problems.
Who can repair my GMC Sierra 2500 engine? Your local Firestone Complete Auto Care fixes GMC Sierra 2500 engines. Book an appointment today! We have thousands of locations across the country.