The exhaust manifold bolts are broken off (one on each side at the rear of the motor resulting in an exhaust leak (ticking noise) and also check engine light "on" bad emission codes.

- Lansing, MI, USA

Engine exhaust manifold bolt nearest the firewall broken allowing raw untreated engine exhaust to be expelled into atmosphere. Exhaust smell in passenger compartment at slow speeds.

- Hudson, WI, USA

Excessive engine knock on cold start hot or cold weather every day been to 2 different dealers and was told was normal and it seems to get worse as I put miles on truck only have 48K on it and change oil every 3K.

- Perkasie, PA, USA

Excessive ticking and engine noice during cold start ups. I was told, by Chevrolet service the ticking was normal but should not last more than 1 minute. However after diganosing the problem, it was discovered that my 2000 Chevrolet Silverado 1500 has a bad lifter. This after only 38000 miles. I filed a claim with Chevrolet they refused to pick up any of the $1300. In repair costs. My truck has a vortex V6, which GM has been manufacturing in excess of 20 years. The bugs should be worked out by now, but after reading the numerous compliants, with regard to the same problem, the bugs clearly have not been worked out.

- Brewster, OH, USA

We purchased a 2000 Silverado 2500. There is a knocking noise in the engine. We took it back to the dealership to look at and nothing could be done about it. GM is well aware of the knocking noise in the vortex 6.0 engine. They told us that this was a common problem. It does not matter if it is a cold start or if it runs all day.

- Cassopolis, MI, USA

Engine knocks on startup...was told by the dealer it is normal...bull@#$#...we are hard working people who must depend on our vehicle to get us to work...I do not trust this truck very far from home. Fyi to all other owners...there is a class action pending on this problem. We didn't plan on paying this much for a vehicle just for it to sound like this. Other dealers are aware of this problem..so trading it off without loosing your shirt is impossible.

- Coleman, OK, USA

ABS occasionally failed due to water, dirt, and rust getting in the sensors. Consumer also complained of the engine knocking. He was then informed that the cause was carbon and the amount of clearance between the pistons and the cylinder wall. They redesigned the pistons for that reason.

- Gowanda, NY, USA

Vehicle is experiencing problems with engine making a knocking noise and the brake system malfunctioning.

- Delevan, NY, USA

Upon starting vehicle computer showed code B2960 which meant engine won't start again, and will take longer to start. Vehicle was taken to the dealer where vehicle was bought, and dealer couldn't reproduce the problem. Vehicle was taken to another dealer and still had the problem.

- Lincolnville, ME, USA

Upon starting vehicle there is a knocking noise in the front end that stops after 3 minutes. Took vehicle to dealer, and dealer stated it was normal. Also, parking brake problem. The vehicle had a knocking noise coming from the engine as well as a problem with the parking brake.

- Tawas City, MI, USA

Consumer states there is knocking noise in the engine while driving the vehicle. Dealer and manufacturer offered a 100.000 miles extended guaranty. Consumer declined. Please provided further information.

- Westport, WA, USA