general problems of the 2012 GMC Sierra

The fuel injection pump cp4 had a catastrophic failure as I was driving on a heavily traveled four lane highway, us rt. 20. I lost power steering and brakes. I felt fortunate that I was not towing a 16,000 lb. Fifth wheel camper down a mountain road. I say this because it was extremely difficult to maintain control over the truck steering it and bringing it to a controlled stop. I have read about these pumps failing on numerous diesel Ford and gm trucks. I also feel if a woman or small person had this happen to them the outcome could end in loss of control resulting in injuries even deaths. The only one that knows the actual number of pumps that have failed is the manufacturers, who will not share that information willingly.

Pulling into a parking spot in a parking garage going no more than 3 miles per hour, or however fast this vehicle can go while foot is resting on break, getting ready to fully break. As I pressed down on break to stop, the vehicle continued as if the anti-lock break system slipped, causing the truck to drive forward crashing through the sheetrock wall and finally stopping after hitting the glass windows. Two weeks later, after all cosmetic repairs were done, the vehicle did the same thing in another parking lot, but luckily broke before hitting the curb and light post. I did feel under my foot on the break peddle, as I pressed down to stop, a slip of some sort which at the same time caused the vehicle to push forward right before stopping. This is definitely a malfunction of some sort with the anti-lock break system.

After exiting interstate lost steering and brakes briefly in parking lot. Pumped brake and both returned after a hissing sound. Recurred a few times in next 6 months or so. Then, in the fall of 2013, lost steering and brakes on I-49/us71b heading south from joplin, missouri. You could pump the brakes and briefly regain, but for the most part all steering and brakes were out. Took truck to GMC dealer where purchased new in bentonville. Dealer confirmed no steering and brakes and damaged bumper while vehicle in its possession by bumping into parking lot barrier. Dealer diagnosed power steering pump problem and indicated that brakes and power steering are tied to same pump/system. Dealer replaced pump but said that even though it was a two or three part system could only replace the pump. Truck continued to have problems and was taken back to dealer following similar episode where lost both steering and brakes. Dealer refused to do anything to replace the other components because could not replicate the problem. Dealer claimed no notice of any other complaints of this nature form gm or any other source. We pleaded with the dealer about it being a safety issue and asked that the dealer replace the other components it identified as possibly related. Dealer took no further action claiming without gm telling them to look further and pay for it they could do nothing else. Truck continues to have problems intermittently. It is nonsensical for a truck to have two significant safety systems tied together with no secondary support or fail safe system to guarantee that operator still have brakes and steering at all times. Truck also has rattles consistent with the service letters / issues noted on this website.