Someone from GM online saw this problem posted, contacted me. When I responded, she asked if I had taken it to a dealer. For an intermittent - are you kidding !!! I referred her to GM Sunroof-Denali complaint #71-1172386297, my only experience with a GM dealer, about the Yukon's inoperative sunroof 5 years ago
http://www.automotiveforums.com/vbul....php?t=1086523 where the dealership literally threw up their hands and actually said "we have no idea what the problem is", then fought about refunding my money, even though they took my money after assuring that it would be a FIX, and not a guess.
So over my dead body will I ever visit a GM dealership again !!!