So you can start out in 2H, drive for a bit and the transfer case will shift itself into neutral? Then if you shift it into 4H you can keep driving? Does it return to 2H when you start it again or do you have to select it?
That sounds like the transfer case control module(TCCM) or selector has a problem. Easy way to test if it is in the T-case or not. Select 2H. Be sure it is engaged. Then unplug the transfer case encoder. Try driving it a bit. If it now stays in 2H without going into neutral it isn't inside the case. The next steps require a dealer level scan tool to test the selector, TCCM and the encoder motor. It would show you which mode the switch says it is in, and what signal the TCCM is getting. Plus what the TCCM is telling the encoder motor. From your description it sounds like the TCCM is faulty, either it has a component that is heating up and switching the T-case or it is shorting.
Wednesday, December 12th, 2018 AT 7:47 AM