It sounds like you have a encoder motor that has gone out which is common. here is the transfer case wiring diagrams so you can see how the system works and which fuses to check before replacing the motor. I have also included the fuse location and the encoder motor replacement instructions in the diagrams below.
Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Thursday, January 16th, 2020 AT 11:06 AM