Why does the check engine light in my Sierra 2500 HD turn on when I start my car?

It's okay if your check engine light comes on when you first start your vehicle. This is a sign that your vehicle is testing its circuits. The light should turn off in a bit, but come see us if it doesn't.

Are GMC Sierra 2500 HD engine noises bad?

Strange under-the-hood noises can point to problems within your GMC Sierra 2500 HD engine. Tapping or knocking could mean you need an oil change. Whistling could mean a belt is misaligned or there's an intake leak. Squealing can indicate a loose fan belt, and grinding might be coming from the brakes, not the engine.

What could damage a GMC engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your GMC Sierra 2500 HD engine?

Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving the engine while still in Park, or slamming the gas pedal while the engine is still cold. Protect your engine’s performance and efficiency by distancing yourself from these habits.

Is it okay to put water in my GMC Sierra 2500 HD radiator?

While it’s not recommended, you can use water in your Sierra 2500 HD radiator in emergencies. Normally, you should only use a 50/50 mix of coolant and water or a pre-mixed coolant. However, if you are completely out of coolant and must continue driving, it’s better to have water in your coolant reservoir than nothing.

What can cause a Sierra 2500 HD engine to suddenly stop?

Reasons your Sierra 2500 HD car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.

Where can I go for GMC Sierra 2500 HD repair?

Your local Firestone Complete Auto Care has you covered with expert Sierra 2500 HD engine repair. Schedule an appointment today and see us at one of our thousands of locations.

Reliable Repairs for 2008 GMC Sierra 2500 HD Engines

Learn about

2008 GMC Sierra 2500 HD Trim Options

Select your GMC Sierra 2500 HD trim level to learn more about GMC-recommended engine repair. Use the following chart to find information.

V8/6.0L

V8/6.6L

GMC Sierra 2500 HD Repairs and Services

Stuff wears out. Even your GMC Sierra 2500 HD's many parts and pieces. 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 2008 GMC Sierra 2500 HD.

We Know GMC Sierra 2500 HD Engines

GMC Sierra 2500 HD drivers trust that their Sierra 2500 HD will take them near and far. You probably thought about that when you got it. However, the wear-proof engine has yet to be invented! Things can go wrong on the road. If they do, you’ll have to find a dependable 2008 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 HD engine will be in good hands. If you think something’s wrong with your engine, schedule an appointment at your convenience. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

My 2008 GMC Sierra 2500 HD Check Engine Light Is On

As soon as your Sierra 2500 HD check engine light turns on, it’s time to get an expert’s opinion. A steady or flashing check engine light could signal a serious issue with your or emission system that won't go away on its own. Possible causes can include a failing oxygen sensor, damaged spark plug, a problem with your catalytic converter, or a leak in the engine vacuum, but that's only a few of the possible causes. Stop by your local Firestone Complete Auto Care to get your Sierra 2500 HD issues diagnosed and our expert techs will get the root of the problem. engine rattling, oil leaks, or misfiring.

Engine Repairs for Your 2008 Sierra 2500 HD

When your GMC Sierra 2500 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 repair isn’t urgent right now, we’ll let you know. We'll also tell you if it's necessary for your safety. We seek to give you all the info you need to make a smart decision about our services. Turn to Firestone Complete Auto Care for your 2008 Sierra 2500 HD engine repairs and you can drive easy knowing that we use GMC-approved parts and fluids — timing belt, motor oil seal, fuses, or other parts.

2008 GMC Sierra 2500 HD Engine Q&A

Why does the check engine light in my Sierra 2500 HD turn on when I start my car? It's okay if your check engine light comes on when you first start your vehicle. This is a sign that your vehicle is testing its circuits. The light should turn off in a bit, but come see us if it doesn't.
Are GMC Sierra 2500 HD engine noises bad? Strange under-the-hood noises can point to problems within your GMC Sierra 2500 HD engine. Tapping or knocking could mean you need an oil change. Whistling could mean a belt is misaligned or there's an intake leak. Squealing can indicate a loose fan belt, and grinding might be coming from the brakes, not the engine.
What could damage a GMC engine? [ordered-list-1-item-3-1]Are you unknowingly damaging your GMC Sierra 2500 HD engine? Certain driving habits can damage your engine and should be avoided. These habits include 'running on fumes,' revving the engine while still in Park, or slamming the gas pedal while the engine is still cold. Protect your engine’s performance and efficiency by distancing yourself from these habits.
Is it okay to put water in my GMC Sierra 2500 HD radiator? While it’s not recommended, you can use water in your Sierra 2500 HD radiator in emergencies. Normally, you should only use a 50/50 mix of coolant and water or a pre-mixed coolant. However, if you are completely out of coolant and must continue driving, it’s better to have water in your coolant reservoir than nothing.
What can cause a Sierra 2500 HD engine to suddenly stop? Reasons your Sierra 2500 HD car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.
Where can I go for GMC Sierra 2500 HD repair? Your local Firestone Complete Auto Care has you covered with expert Sierra 2500 HD engine repair. Schedule an appointment today and see us at one of our thousands of locations.