Ticking under hood. Exhaust leak due to broken exhaust manifold bolt passenger side near firewall. Tried to loosen other bolts, 3 more broke. Truck has very low miles, 8.1L motor. Internet shows thousands of same issues. Bolts used are very thin for what they do.

- Willington, CT, USA

Exhaust manifold bolt on driver side at rearmost part of engine has broken off.

- Fitzgerald, GA, USA

After discovering an exhaust leak performed a visual inspection of the engine. I have a 2004 Silverado with the 6.0L. I ave discovered that there are an abundance of these vehicles out there with the same problem. This is causing exhaust fumes to enter the engine compartment and cab of the vehicle.

- Pearl River, LA, USA

The contact owns a 2004 Chevrolet Silverado. The contact stated that while driving at various speeds, the check engine light illuminated and the vehicle suddenly stalled. The contact indicated that after restarting the engine the vehicle operated as normal. The contact also indicated that the passenger side seat belt had malfunctioned and the passenger was unable to move while the seat belt was in the locked position. The vehicle was not diagnosed or repaired. The manufacturer was notified of the defect but no solution was offered. The failure mileage was 130,000.

- Evanston, WY, USA

I have the castech heads on my truck that are known for getting cracks in them and leaking anitifreeze into the engine. The way it sounds there should of been a recall on these heads, this isn't a normal wear and tear deal. Why should the consumer pay for the cost of replacing something that obviously is a manufacturer defect since more than just one person is complaining. It seems like also that GM has helped a few people and then told others that they can't help.

- Kansas City, MO, USA

The contact owns a 2004 Chevrolet Silverado. The contact stated that the vehicle was blowing cold air and the defroster failed. The vehicle was taken to the dealer who stated the cylinder head had cracked. The vehicle was not repaired. The manufacturer was made aware of the failure however provided no further assistance. The failure mileage was 110,000. The current mileage was 112,000.

- Haverhill , MA, USA

Engine lost power in heavy traffic at highway speed due premature failure of diesel fuel injector. Come to find out injector have known defect and high failure rate.

- Apache Junction, AZ, USA

I went out to leave for a meeting and started my truck. I heard a ticking noise that I had not heard prior to this morning. I opened the hood to investigate the cause of the ticking and discovered on the left bank one of the exhaust manifold bolts was missing the head. I then went around to the right bank and noticed that the exhaust manifold was broken completely about mid way of the manifold. I have owned this vehicle since it was new off the dealership and have had very little issue with it until this issue popped up. I have done some research and discovered that this is a major problem affecting Chevrolet and GM vehicles with 8 cylinder engines. This vehicle is used as a daily driver and is not used for commercial towing, nor is it used for towing on a regular basis.

- Corsicana, TX, USA

In January 2004, I bought a new Chevy 3500 duramax diesel truck. Since March 2005, I have had to have the injectors replaced a total of 6 times. Now at 202,000 the injectors need replaced again. Chevy will not help out on this problem. I have read that everyone should file a complaint with this department so that this can be investigated. In November 2011, someone was told there were not complaints. Being a Chevy owner with these injector problems, I am writing to complain. Hopefully, this department will conduct the investigation and help all the other people with this problem get a response from Chevy to do something. These trucks are not cheap and just because we use our trucks and put miles on them, and they have repeated failures, we should not have to bear the burden. This problem with my truck is in the design. How many people replace injectors every 30-40K miles? this is what I have had to do over the last 7 years.

- Bonsall, CA, USA