One problem related to battery dead has been reported for the 2015 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Yukon based on all problems reported for the 2015 Yukon.
Drivers and passenger brake light go out intermittently. Passenger stays off for long periods of time. Looked into replacing no idea if it will fix the problem. Cost at least $500. Each parts only. I have seen so many other vehicles like mine same problem. Headlights also going out, water inside of cover. Led and turn signal went out on drivers side replaced for a cost of $900. 00, (just for the headlight) again no guarantee it will keep working. Also battery went dead replaced battery. New battery also went dead. Car alarm went off the night before battery dead in the morning. Has been in the shop 3 weeks now. Same thing happens alarm goes off kills battery. Shows massive drain and set about 32 codes. The drain doesn't register after that. Recharge battery car is not running when this happens. Problem repeats every time after charging the battery. Something in the wiring is shorting out. Tested both batteries they both test good. Afraid of what will happen next with the electrical on the vehicle. Not sure if the lights have anything to do with this or not. When ordering headlight and asking about brakes told by dealer parts they sure are selling a bunch of these. I have had people driving down the road stop me to tell me my brake light is out. I did not know that the turn signal on the front was not working until a car pulled out in front of me while waiting to make a left turn. I got out and looked at the light and it was not working. I cannot drive the vehicle at all because it keeps draining the battery. I have a ase certified master technician working on the vehicle in a reputable shop.