Exhaust manifold bolts breaking leaving studs in the heads, heating up engine compartments, releases carbon monoxide, affects O2 sensor and catalytic converter. Will not pass emissions in some states. GM not standing behind this 1999-2008 issue. It is a safety issue and is expensive to fix. GM mechanics denying any such issues. Please check- in to this. Our whole fleet and our personal trucks affected by this.

- West Lebanon, IN, USA

2002 2500hd Chevy Silverado stalling for the last 6 months randomly. Taken to have fixed cannot identify the problem with computer scan. Truck stalling on the highway many times. Once truck stalls, turn off key, let set for 10 -15 seconds, restart. I guess the system resets itself. This is not safe.

- Olathe, KS, USA

2002 Chevrolet 2500hd w/ 8.1L gasoline engine: The failure of the crankshaft position sensor on these engines appears to be a very common problem. This sensor failed on my truck at only 30K miles! I know of two other '02 trucks w/ this engine that also had the sensor fail and many others have been discovered while doing research on this problem! the seriousness of the problem lies in the fact that the truck suddenly stops running for no reason and you lose all power for the brakes and steering. At times it will restart without any problems once you shift to neutral, but other times it may not restart for a day or more. This was a huge safety issue for me since I tow a 10K lbs. Fifth-wheel with the truck! my truck stopped running four times over the course of two weeks as a result of this problem. Everytime was while traveling in traffic, with only one of the times while being stopped at a light! my truck is no longer under warranty due to the time limit of 36 months expiring. To have such a part fail with only 30K miles on the engine is outrageous. One of the other trucks I know of had the sensor fail around 55K miles. Same problem, it would just stop in traffic or when pulling out of a light or stopped turn. Again, a huge safety issue!!! the costs to me to repair my truck follow: Ac delco replacement crankshaft sensor - $69.26 tow charges to tow to joseph Chevrolet, cincinnati, oh - $58.85 labor due to the original sensor breaking in the block! - $336.54 total cost to replace the sensor after only 30K miles! = $464.65 again, I have to repeat how large a safety issue this is on these trucks!!! the engine just stops for no reason at any time, highway, slow moving, stopped, etc. It may restart, but then again it may not for many hours! the trucks with these engines in them are generally towing large trailers behind them. This compounds the safety aspect of the problem.

- Cincinnati, OH, USA

2002 Chevrolet Silverado with noisy engine getting worse the dealer tells me this is normal. This is not normal GM denies they need to fix the problem

- Gorham, NH, USA

Vehicle seized while driving 55 mph. Vehicle was restarted, and was driven to consumer's home. Dealer had not been contacted.

- Woodville, MS, USA

A recall (04V357000) was issued for the cam shaft position sensor. The consumer was unable to find an authorized dealer to repair the vehicle. Please provide additional information.

- West Winfield, NY, USA

Vehicle stalled while driving at 55 mph. The consumer was told that the distributor cap and rotor needed to be replaced. The problem continued, then the consumer was told again that the distributor cap and rotor needed to be replaced again. The dealer found that the A/C line was routed directly above the distributor cap to retain moisture and misfire.

- Kokomo, IN, USA

Piston slap.

- Peabody, MA, USA

Many of the problems took several times in the shop to fix. The castrophic failures in the engine & transmission have never been fixed. The truck has lunging, dead spots & surges & the transmission clunks (shifts hard, jerky) the auto may or may not accelerate on demand & will later accelerate when you need to apply the brakes.

- Ridgecrest, CA, USA

Upon a cold start, engine would make noise. Possible problems with engine.

- Riverside, NJ, USA

While driving the check engine light appears on the dashboard and remains lit. The driver drove the vehicle to the dealer for inspection. The mechanic replaced the solenoid seal but the problem still exist.

- Ethelsville, AL, USA

Consumer started the vehicle early in the morning and heard a noise. The noise sound like a diesel engine. After vehicle is warmed up, there was no noise. Dealer stated that this type of noise was common to any vehicle being started early in the morning.

- Newtown, CT, USA

Air conditioner (A/C) line runs over the top of the distributor, causing condensation in the distributor. When this occurs, it results in engine misfiring and vehicle stalling. At 22,000 miles transmission went out.

- Mobile, AL, USA

Consumer started vehicle early in the morning and heard a loud noise. After five minutes, vehicle warmed up, and there was no noise. Dealer stated that this type of noise was common to any vehicle being started early in the morning.

- Athens, AL, USA

Brand new 2002 Chevrolet truck makes knocking noise since new. Chevrolet agrees its a problem but will not fix it. The knocking is heard when starting vehicle. GM needs to correct this issue before it cause engine failure.

- Blanchard, OK, USA

While driving about 55 mph on the highway, the vehicle began to overheat without prior warning then the check engine light illuminated.

- Acton, MA, USA

The check engine light illuminated on the dashboard, and then the vehicle over heated.

- Acton, MA, USA