Circuit Description
WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized through Motor Control A or Motor Control B, the ground is provided by the opposing Motor Control circuit and then grounded through the transfer case shift control module's ground circuit.
This DTC detects only an open in the module ground circuit and not the Motor Control circuits.