I been having a problem with the exhaust manifold bolts breaking off. I spent a ton of money replacing O2 sensors over the last 4 years. I've just currently found out that the O2 sensors were not bad, it was actually the exhaust header bolts breaking allowing my emission system to malfunction. I've had 3 bolts replaced 2 months ago at a tidy cost of $1000. One week ago I was driving down the road and smelled exhaust fumes in my truck cab. I took my truck to my mechanic and he found 3 more bolts on the right side of the engine broken off. Not only am I without a vehicle (because at this time I cannot afford the repair) I think General Motors should correct my problem and pay for previous repairs. This is poor workman ship on their part not to mention a serious safety hazard. All GM trucks manufactured between 1999 and 2007 with V-8 engines have this problem. GM should man up to this issue and recall and repair the faulty exhaust manifold bolt problem. I for one think this could be a safety issue and environmental concern. My truck cannot pass an environmental emissions test at this time.

- Maumee, OH, USA

Right rear manifold bolt broke allowing exhaust leak with accompanying noise. Repairs were made with subsequent failure. Dealers declined any type of warranty or other assistance. Subject bolt has failed for third time.

- Laingsburg, MI, USA

While driving 60 mph vehicle stalled. The consumer tried to restart it, but was unable to do so. The consumer had the vehicle towed to the dealer for inspection. The mechanic replaced the electric ejection pump, however the problem recurred. No matter what speed the vehicle was going, the engine would die as the key was turned off. Sometimes the vehicle restarted immediately, but sometimes it wouldn't restart until it was "worked with." The electric injection pump was replaced for a third time. Two new alternators had been placed in the vehicle but at times, frequently killed the pump which drained the battery. The vehicle had stopped in fast moving traffic. The emergency flashers were inoperative, sometimes there would be a hard start then the service engine soon light would come on, the vehicle would die when the headlights were turned on, the A/C switch had broken, and there were leaking lines.

- Princeton, WV, USA