Service 4wd C0321 code


New member
May 20, 2024
Bought a 03 sierra with a service 4wd light. It had a no communication code so I bought a used transfer case control module, the old one was massively corroded inside. Now the communication code is gone but I have a c0321 transfer case lock circuit fault. Do I have to get the module programed? Both 4wd fuses that I know of are good and none of the wires going into the transfer case motor are getting power with the key on, figured one would have a signal voltage or something? Any help would be greatly appreciated