Alan Higgins

I took it back to the GMC dealer 3 times and couldn't figure it out. I then called the service manager the Chevrolet dealer i bought my ZL1 from and he said he could work on any GM car or truck. The Chevrolet dealer kept it for a day testing it and they were certain it is the hill hold assist disengaging. It activates at a 5 percent angle and less depending on the situation. My truck doesn't do it at every stop but it is annoying, i have gotten use to it now.