Hi there guys. I have a bone stock 2014 and I am having the same issued. Most of the time the issue occurs when I am pulling into a driveway or going into a parking spot. At times the car died to the point that none of the courtesy light or door chimes would work. No lift kits. No radio add on's. I have taken the car to the dealer twice and they "cant duplicate the problem" so that means nothing get done. On top of that, the service guy says that no trouble code are being stored. That means, they have to be plugged into the truck if/when it happens again. Honestly, my truck is unsafe. I almost hit another vehicle because the damn steering locked. Thankfully it happened for a split second and then released but the potential for sever damage is very present. Maybe we should consider a class action suit to have the GM engineers to pull their thumbs out of their ass long enough to resolve this issue.