Hey, I have a GMC Sierra 1500 2009 Z71, I have a problem with the 4 wheel drive, it can get the error message but there was nothing to notice. I always drive in AUTO, then I went shopping again. After shopping, I started the GMC and it jumped forward when igniting in P. Then I switched to brR and it didn't take the gas and the brake pedal was stiff. Once again identified and restarted, it drove again without a problem. A few days later, the message is permanent and when driving it feels strange when starting and cornering and you can hear the divs working. at a standstill on D it doesn't roll off either, you have to accelerate it feels like pushing against the brake. if everything rolls ok, if it is about to come to a standstill and should actually be rolling, it will stop without braking. I am from Germany, it is very difficult to find suitable contacts here. The GMC is an heirloom from my dad from Texas and is very important to me.
