I have a 99 GMC Yukon. I have the 2wd, AWD, 4HI, & 4 LO option, and the truck will shift from 2wd to AWD or 4HI while moving just like it supposed to do, but it won't shift back to 2wd till I stop and turn the truck off and start it back up.
I did some research and alot of people suggested...