Hi guys, I also have this issue with my 2015 yukon denali. I just called GMC dealer and gave them the TSB PI1376 number and told them my issue to make an appointment. They told me that its not listed under my specific VIN. They're gonna make me bring it in and I'm sure, try to reproduce the issue. I just hope they cover it. If not, any words of advice? Who should I speak with etc? Just because TSB isn't attached to my VIN on a 2015 vehicle doesn't mean its not happening and it shouldn't be attached.
Thanks in advance!