Hello joined this forum today to try to find some resolution to this problem. I have a 2014 Silverado LTZ I've had for 18 months. These are my symptoms. Without any notice when the wheel is turned all the way to the left it violently steers back to the right. you cannot stop it. usually happens in paring lot or stopped at light starting to turn. The stabilitrack warning that is turned off comes on the dash in front of the steering wheel. The doors lock and radio and ac is powered down. if you keep trying to turn the wheel the truck shuts down. The first time this happened was 2 weeks after bought it. The truck would go dead and not restart for about 5-10 minutes. The dealer said the battery was bad and since it had electric power steering the problem was the battery. (200.00). Its been happening again every few weeks and of course not when the dealer has it. I watched a Youtube video claiming the fix was to remove the side pillars on the sides of the windshield and remove a nut on top of a bolt that is supposed to be the negative ground for the vehicle. The sound deadening foam was wrapped under this nut and should b cut off and nut tightened back down. Done that and thought tat it worked but today 1 month later it happened again. Only this time i was pulling into a parking spot and it happened again and the warning message came up that park assist was disabled. Also sometimes i'm driving down the road and a message that says " select tune to so and so channel and there is option to select or dismiss. I really don't want to get rid of the truck i love it and great mileage but what happens if i traveling 70 mph? I will keep looking on this forum for someone that has found a solution or cause.