CP4 high pressure fuel pump failed causing Loss of Motive Power (LOMP) in Oct of 2018. Truck became hard to steer and brake but I was traveling at a lower speed. Had it of been 1 hour later I would have been at freeway speeds pulling a 13000lbs trailer. I had the truck towed to a local dealer where they diagnosed the truck as having a failed CP4 high pressure fuel pump made by Bosch. They informed me that the entire fuel system would have to be replaced do to the large amount of metal contaminants that this catastrophic failure produces and spreads though out the entire system. The total cost for the repairs were not covered under any type of warranty or recall and had to be paid entirely out of pocket. Not only was this a huge inconvenience as I was trying to leave town for a vacation it was very very expensive. I still can not understand why there has never been a recall on this issue. I think it can be related to a safety issue as a LOMP. I believe GM knew that the CP4 pump was and could be a faulty product but continued to use it.

- Ogden , UT, USA

Transmission control module (tcm). Failure of this part leaves the vehicle inoperable and unable to drive. Being stranded, or in traffic can cause injury to myself or any other driver that may encounter me disabled unknown, major problem with this make and model of vehicle. Dealer inventory of the part is exhausted and trucks are sitting inoperable all over the U.S.a. no indications of a issue were displayed prior to the problem. The problem does display on dash, after the problem shows

- Clancy, MT, USA

The contact owns a 2011 Chevrolet Silverado 3500. The contact stated while driving approximately 10 MPH and slowing for a traffic signal, the vehicle downshifted very hard. The contact stated that there was an audible clunking sound while the transmission was downshifting. The contact stated that at approximately 1 MPH, the rear wheels locked up and the vehicle came to a sudden stop. The contact stated that the failure had recurred and was unpredictable. The contact stated that the "Shift Inhibited" message was displayed. The contact stated that the rough shifting occurred at various speeds while upshifting or downshifting. The contact had taken the vehicle to an independent mechanic where it was diagnosed and determined that the Transmission Control Module (TCM) needed to be replaced. The contact was informed that the TCM module was on a national back order. The vehicle had not been repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 220,000.

- Minot, ND, USA

Diesel exhaust filter (def) and flow reduction tube on duramax lml engine. Fautly def requires extremely high temperatures to clean - or regenerate - causing the def and reduction tube to fail. High temperatures are a fire hazard to vehicle and grass or other terrain over which the truck is parked. GM no longer manufactures the reduction tube, GM part number 25960609 forcing the consumer to wait for GM to make part on special order basis - over 30 days - or force consumer to remove def or make other fabrication, order to operate the vehicle. GM is aware via customer service and dealer complaints that the lack of part 25960609 availability is a nation-wide problem and has a high failure rate. GM stopped production as a cost saving measure. The duramax lml engine is in service mostly as commercial vehicle fleet. Thus, there is a high probability of unsafe fabrication in order to restore vehicle operation.

- Fredericksburg, VA, USA

The contact owns a 2011 Chevrolet Silverado 3500. While driving at 70 mph, the vehicle shifted out of the drive position and into the neutral position independently. The vehicle's gauges fluctuated on the instrument panel. The vehicle was taken to the dealer, but was not yet diagnosed. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was 62,175.

- Yukon, OK, USA

The contact owns a 2011 Chevrolet Silverado. The contact stated that when adding oil to the vehicle, it was discovered that the transmission dip stick tube had separated from the vehicle. The vehicle was taken to a dealer, who diagnosed that the dip stick tube needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 70,000.

- Texarkana, AR, USA

Truck downshifts to passing gear such as entering a highway on ramp and stepping down to enter slower traffic engine revs to red line on tach because it does not shift into any gear leaving you hung out to dry in traffic until you figure out what's goin on you have fully let up for it to find a gear by this time your speed came drop 10 mph very dangerous, had to two different dealers twice both said it has no problem one said it was the torque management system and it was normal.but if I wanted it to go away take it some where and have the program wiped from computer but warranty will then be void.also truck slams into gear when slowing down to go around a corner.when starting vehicle it jumps forward so bad I am afraid to keep it in my garage. Spoke to two different Chevy reps both are like talking to a wall, they are not employed to help you just to run around in circles until you give up.research all Chevy products before buying. Silverado have alot of transmission issues. Just a horrible truck.

- Trenton, NJ, USA

2011 Chevrolet Silverado. Consumer writes in regards to mechanical, electrical and transmission problems with vehicle. The consumer stated while driving down the road on a steep incline, with the truck and trailer loaded, the engine's RPM suddenly went to 5500 RPM, without increase in acceleration. He depressed the brake to release the cruise control, and strongly pressed the gas pedal several times before the engine would return to a normal RPM.

- Magdalena, NM, USA