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

Generally, your check engine light turning on upon ignition is not a bad thing. This is a sign that your vehicle is testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why is my GMC Sierra 2500 HD making engine noise?

Unusual noises can signal a problem with your GMC Sierra 2500 HD engine. Tapping or knocking could mean you need an oil change. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.

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 hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or slamming the gas pedal while the engine is still cold. Steer clear of these habits to help protect engine performance and efficiency.

Can I add water to my GMC Sierra 2500 HD radiator?

It’s not recommended you put water in your Sierra 2500 HD 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.

Why did my Sierra 2500 HD engine 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.

Who fixes GMC Sierra 2500 HD engines?

For GMC Sierra 2500 HD engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.

2012 GMC Sierra 2500 HD Engine Repair

Learn about

2012 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

Repairs for Your 2012 GMC Sierra 2500 HD

Nothing lasts forever. Even your GMC Sierra 2500 HD's many parts and pieces. When something breaks, we're ready. Select a service or repair below to learn more about what we can do for your 2012 GMC Sierra 2500 HD.

We Care for GMC Sierra 2500 HD Engines

GMC Sierra 2500 HD engines are known for their reliability. You probably thought about that when you got it. However, the wear-proof engine has yet to be invented! Things can go sideways sometimes. When they do, you might find yourself searching for 2012 GMC Sierra 2500 HD engine repair or replacement parts. 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. After all, Firestone Complete Auto Care is one of the most popular picks for professional engine repairs thanks to its service and affordability.

My 2012 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 check engine light that’s flashing or steadily illuminated could point to problems with your fuel injection, Causes may include a faulty oxygen sensor, worn spark plug, a clogged catalytic converter, or a leaking engine vacuum, to name a few potential sources. Bring your Sierra 2500 HD in for an on-board diagnostic check and our expert techs will get the root of the problem. Other signs it's time for GMC Sierra 2500 HD engine service might include burning smells, or misfiring.

2012 Sierra 2500 HD Engine Services

If your 2012 GMC Sierra 2500 HD needs engine repair, our technicians will provide you with a thorough explanation beforehand. 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. Choose Firestone Complete Auto Care for GMC Sierra 2500 HD engine repairs and you can feel good knowing that we only use GMC-compliant replacement parts such as the timing chain or belt, valve guide seal, sensors, or another part.

Engine Q&A 2012 GMC Sierra 2500 HD

Why does the check engine light in my Sierra 2500 HD turn on when I start my car? Generally, your check engine light turning on upon ignition is not a bad thing. This is a sign that your vehicle is testing its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why is my GMC Sierra 2500 HD making engine noise? Unusual noises can signal a problem with your GMC Sierra 2500 HD engine. Tapping or knocking could mean you need an oil change. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.
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 hurt your engine. These habits include driving on an empty fuel tank, flooring the gas pedal while the car is in Park, or slamming the gas pedal while the engine is still cold. Steer clear of these habits to help protect engine performance and efficiency.
Can I add water to my GMC Sierra 2500 HD radiator? It’s not recommended you put water in your Sierra 2500 HD 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.
Why did my Sierra 2500 HD engine 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.
Who fixes GMC Sierra 2500 HD engines? For GMC Sierra 2500 HD engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.