Receiving "SERVICE 4WD"
Dash buttons inoperative.
Replaced Transfer case motor(Delco)
Now I'm short a few hundred dollars and nothing has changed. I'm going to try the dash buttons next. Does that seem to be the next best action?

Or maybe the control module?
BTw, the truck runs great.

 

I tried the other way, Buttons first and the Delco motor fixed it. I bet it is the dash switch. Beware of the cheap knock off switches. I would get an OEM switch.