One problem related to battery dead has been reported for the 2015 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Sierra 1500 based on all problems reported for the 2015 Sierra 1500.
Has had an issue with accessories flashing off and back on. Reported it to a GMC dealer and they were unable to duplicate but said that the battery was bad and most likely what was causing it. It did fine for a while then began doing it again. This time however it caused a loss in power steering and I ended up in the ditch. Later it did it in a parking lot and was able to video tape it. Took it to the dealer and showed them the video. They were unable to duplicate for 4 days while I was paying for a rental because mine wasn't safe to drive. On the fourth day I provided them with a service bulletin I found that addressed the issue as being a fluctuation in power and for them to check the cables and do a drop load test. They did and it failed. I then had to pay 376. 00 to replace them plus having to pay for a rental after asking for a loaner. This is a problem a lot of people are having. Just a quick google search makes that plain. Gm isn't wanting to admit it. I have the video but I don't think it will allow me to upload it to the form.