Well after 4 1/2 hrs and 2 different dealerships My stereo works First Tech and service manager were clueless then after nearly 4 hrs of getting jerked around they got pissed at me because I demanded my truck back. I was more then patient IMO but enough was enough. I went to another GM dealer 2 miles up the street and 30 minutes later I was on my way The second tech said he had to go back in and RE-Lock the unit and start over but it was no big deal. Either of us could figure out what the first tech with "30 years experience" (His words) was doing for 4hrs