Broken or missing exhaust manifold bolts causing exhaust leaks. Potential for carbon monoxide leaks into the driving compartment. Upon researching on the internet this seems to be a very common and expensive problem. With GM engines from 1999 to around 2007. Just found this problem on my 1999 Silverado on 5/20/16. I have owned this truck since day one and have an excellent service record at a well know dealership. Vehicle was stationary when the problem was diagnosed.

- Englewood, CO, USA

Brakes: Since approximately 136,000 miles to present miles, the vehicle has exhibited an ABS and brake warning light intermittently on the dash. This is a known GM issue that was recalled in certain states, but not all. It stems from faulty soldering points in the ABS control module and can affect the vehicles ability to stop correctly which could result in an accident. Engine/ emissions: The passenger side exhaust manifold bolt has broken off. This is a known issue with this 5.3L engine as well as the 4.8L and 6.0L engines. GM has failed to recall in spite of having thousands of complaints. The issue can cause failed emissions and potentially engine fires. Engine: As of 164,000 miles, the engine is experiencing loud "piston slap". this is a known issue which GM addressed through redesign in later models. It leads to excessive engine wear and potential engine failure. It appears to be a factory defect, yet GM has claimed it is not important despite numerous complaints from customers that the engines have required replacement as a result.

- Vancouver, WA, USA

This truck has had an exhaust tic for many years. I just thought it was a lifter noise when in all reality while changing spark plug and wires about 2 months back I found the broken exhaust manifold bolts. Upon further research on the web I found this is an issue on 80% of these GM trucks. I think there should be a recall because of possible carbon monoxide poisoning while operating these vehicles and the emission problems encountered. Thank you for your attention to this issue.

- Casper, WY, USA

Started my truck one day and heard a noise I haven't heard before. Looked under hood to see where it was coming from and noticed noise was coming from the exhaust manifold. The bolts have broken off leaving the manifold leaking exhaust fumes. Came to find out that this is a common but very dangerous problem on Chevy trucks. Many Chevy vehicles have this issue and if not corrected could lead to more engine troubles or worse yet a fire.so now my vehicle is a safety hazard! Chevy should recall this safety hazard, which could become dangerous.

- Menomonee Falls, WI, USA