The 2007 to 2014 GMC Sierra 3500 HD has a 6.0-liter V8 that’s known for being reliable. It also has some problems it typically runs into. Read on for the most common 6.0 Vortec engine problems and fixes.
2007 to 2014 GMC Sierra 3500 HD 6.0 Liter V8 Vortec Engine Problems
1. Oil Leaks
Symptoms of Oil Leaks
- Oil leaking from the valve cover gasket
- Oil leaking onto the exhaust
- Leaking oil cooler lines
- Leaking oil between engine and transmission
- Oil leaks from rear main seal
How to Fix Oil Leak Problems on the 07 to 14 GMC Sierra 3500 HD 6.0 Liter V8 Engine
Valve Cover Gasket
To fix a leaking valve cover gasket, remove the coil packs and then the bolts from the valve cover. Steps include removing the gasket, cleaning the area, and replacing the gasket.
Oil Filter and Oil Pan
If oil is leaking between the engine and transmission, check and make sure the oil filter isn’t leaking. If it is, replace it or check if it’s sealed properly and re-seal it if needed. Check the oil pan gasket if the oil filter isn’t leaking. To replace the gasket, steps include removing the oil pan, removing the gasket, cleaning the area, and replacing the gasket.
Rear Main Seal
If oil is leaking from the rear main seal, the transmission needs to be removed. This is a detailed job but is not as common as the other oil leaks.
Oil Cooler Lines
The oil cooler lines run from the engine to the radiator. If they are collecting moisture, replace them.
2. Broken Exhaust Manifold Bolts
Symptoms of Broken Exhaust Manifold Bolts
- Exhaust manifold bolts breaking
Causes of Broken Exhaust Manifold Bolts
One of the most common problems with the 6.0-liter Vortec engine is the exhaust manifold bolts. The bolt can shear off flush with the exhaust manifold.
How to Fix Broken or Missing Exhaust Manifold Bolts
If the bolt is sheared, it can be removed with the other exhaust manifold bolts removed. Pull it back and forth and out with locking pliers. A more advanced way to remove it is by welding a nut to the stud to twist it out.
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3. Throttle Body Problems
Symptoms of Throttle Body Problems
- Check engine light code P0121
Causes of Throttle Body Problems on the 6.0-Liter Vortec Engine
Sometimes the throttle body is dirty from carbon build-up and sometimes it is defective.
How to Fix Throttle Body Problems
If the throttle body is dirty, clean it. If it’s broken, replace it.
Learn How to Find and Fix More Than 6.0-Liter V8 Vortec Engine Problems
Learn how to find and fix more than engine problems. Our how-to videos have instructions and tips from expert mechanics to help you find and replace failing parts.
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