Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry for the long wait
these come down to usually a blown fuse or the encoder motor on the drivers side of the transfer case
but very hard to tell without knowing if there are and what code or codes are set in the 4WD module
can you check and be sure the fuse call 4WD in the inside fuse box and the fuse called ATC in the under hood fuse box is NOT blown ?