Engine will cut-off while driving without warning at both high and low speeds. Immediate engine restart may or may not be possible. Problem has occurred for approximately one year w/O permanent failure and w/O useful diagnostic codes. Frequency of failure has increased to 2-3 times per week. Several accidents have been narrowly avoided while in heavy, high-speed traffic. No discernible failure pattern has been identified, to date. Engine cut-off can occur at any time. This vehicle is a Silverado 2500hd truck w/8100 vortec engine and allison automatic transmission.

- Lovettsville, VA, USA

Chevy Silverado 2500 hd w/ 6L engine-- problem with throttle sticking. Carbons up every two months around throttle valve and throttle sticks. Then takes excessive throttle pressure to try to move. ---is a serious safety issue when moving in tight quarters. Chevy has issued service modifications for 5.3L and 4.8L engines for same problem but has ignored the 6.0L. Cleaning the carbon works for only two months then problem recurs. Chevy should make a field fix like the other models before someone gets hurt.

- Bellefontaine, OH, USA

On 12-2002 oil light came on check dip stick no oil then 8-2003same thing happen this time service tech came out put 3qt in.

- Dover, PA, USA

2002 Chevy Silverado with a 4.8L engine knock, from what GM said is piston slap. They said they will not fix this problem at this time. They said they send out a letter of warranty for six years or 100,000 miles, if engine fails due to the piston slap/knock. I think that something needs to be done about this. There could be a safety issue with this, such as engine failure on the interstate. We the consumer should not be told to deal with it, when paying up to 30,000 dollars for a new vehicle, that has a piston knock. This needs to be fixed, not covered up.

- Perryville, MD, USA

2002 Chevy Silverado 4.3 engine has knock when starts up, also has diesel sound and vibrates between 15 to 25 mph.

- Tampa, FL, USA

I too have the piston slap problem with my 2002 Silverado hd 6.0L engine. I took it to the dealer at about 2400 miles and was handed a technical bulletin that was dated from 1999 (problem has been known since then) telling me that GM is working on a "fix". they did want to look at the truck to make sure nothing else was wrong. There is no "fix", just an extended warranty on the engine alone even though I already paid for the extended warranty for the entire vehicle. You cannot get the warranty agreement mailed to you to look it over, they will only send it if you agree to accept it over the phone. Bought the truck in good faith and was sold a lemon. Maybe if their profits were affected by a recall they might think twice about stealing and lying to consumers.

- Collinsville, OK, USA

I purchased a 2002 Chevrolet HD2500 with a 8100 liter engine. I have now been told that this engine will use 1 quart of oil for each 1,000 miles driven. I believe that this is an excessive amount of oil to be used in a new vehicle. Has Chevrolet done anything to correct this mistake. Is there a recall for this problem?

- Texas City, TX, USA

I have a 02 siverado a 5,000 miles the motor started knocking, the dealership said it's out of there hands, and told us to call Chevrolet document #816465, which says the knocking is normal, and all they can do is extend the warranty. We all know this is not normal, go to www.bigclassaction.com and file a complaint. If we can get everyone together we can get a class action suit against them. We all have paid to much for our vehicles to letgm get by with this. Lets stick together, tell every one.

- Marble Falls, TX, USA

There is knocking noise coming from underneath the vehicle. Due to missing piston from the engine please provide additional information dealer is aware of the problem.

- Valley Park, MI, USA

While driving the vehicle at 50mph engine will start loosing or gaining power. Dealer has been notified.

- Hillsboro, NH, USA

Duramax engine, the engine was ticking when vehicle was purchased (600 miles), dealer stated this was normal. This ticking sound has gotten worse, dealer still says this is normal.

- Lake Jackson, TX, USA

Loud hard knocking noise coming from engine at cold start up. Then after engine is warmed up after driving and deceleration you can still hear the knocking noise, just not as loud as at cold start. Taken to dealership, and advised Chevrolet was aware of problem, and did not have a solution. Advised by dealer it would not hurt engine, but I disagree, the very hard knocking can not be good for the valves, or crankshaft, and has to be causing some sort damage within the engine itself.

- Newport, OR, USA

No summary listed for above vehicle.

- Willmar, MN, USA

There have been repair attempts none have been fully sucessful. No safety defect listed.

- San Lorenzo, CA, USA

Engine has a cold knock when starting up in mornings, also GMC has acknowledged the problem. It's a characteristic design in vehicle.

- Salinas, CA, USA

Vehicle stalled at 70 mph, vehicle is at dealership at this time.

- Burlington, MS, USA

Engine makes loud "ticking" noise when warm at idle. GM states normal condition. Not all duramax deisels make this noise. It cannot be normal. GM has no interest in pursuing. Although this may not be a safety issue, unless the engine explodes as a result, it still is very disheartening that GM will release the product with bugs and the customer is forced to accept.

- Salt Lake City, UT, USA

Ongoing ticking noise in 5.3L V8 engine while running. Dealer notified. Feel free to profvide any further information.

- Houston, TX, USA