Code C0398, TCCM will not relearn?

The truck listed above is a 2011 Sierra. Tech diagnosed as encoder motor faulty. Replaced encoder motor still has the same c0398 code. Truck won’t perform relearn off the 4wd switch or solus scanner. Have power at the encoder motor and 4wd switch sends signals within spec. Had spare transfer case module on hand, installed with the same results. Transfer case range sensor reading -145° to205° when checked. Live data at scanner shows tcem @360° while rps @205°. Every time there’s a key cycle truck changes from 4hi to 4l to N.