Having an ongoing issue while driving. I've ben on the highway in the rain and snow going 65-70 mph as well as dry pavement. All of a sudden my dashboard will light up saying service traction control, brake system, ABS, park assist off and check engine lights up and blinks. I will loose my brakes I then have to pump my brakes several times to get to even slow down or stop. It's also happened when I am driving down a residential street. When I pull over turn the truck off and goes back to normal for a short distance. Weather doesn't seem to be a factor or speed. Taken vehicle to dealership and they don't find anything wrong. Had them replace bearings as well as speed sensors and it is still happening. And I had a code come up for cylinder misfire and knock sensor. Then take it garage and nothing is wrong.

- Rochester, NY, USA

The truck was parked and running. It suddenly began to idle as if someone was pushing down on the gas. I immediately shut the car off. I turned it back on and the engine light was on and it read "reduced engine power". it seemed to drive ok. I called dealership and made apt for Tuesday. (it was Thursday) the next day I drove it to local garage to read engine code. It was P2135. The truck then stopped accelerating. It would not go over 25mph. It took about 2 full min to get it at that speed. When I would break, the truck would jump as if did not want to stop. The dealership diagnosed the problem as the throttle position sensor cover. I was informed that GMC is aware that there is a problem and has since corrected it. However, there is no recall as there is no alleged safety issues. I believe that when you have a 1,2, and 3 year old in the truck in rush hour, it is dark outside, and you are an hour away from home it is a huge safety issue when your truck won't accelerate! I have contacted GMC who refuses to take responsibility for this issue. Please issue a recall as this is a known problem.

- Medway, MA, USA