Gotta tell that to 2 of my work colleagues with Sierras, one is a 2014 Denali and the other a 2015 SLE. Their issue? If they drive their truck in 4wd and park it overnight, the truck switches back to 2wd and gets stuck there....GMC told both of them that this is a software issue that they don't have a fix for yet. #sucks
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