Circuit Description
WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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, DC 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 ground circuit. The motor, through a series of gears, rotates a shaft, which moves the mode and range forks to shift the transfer case between the following ranges:
- 4H
- The AUTO or the Adapt mode
- 2HI
- N
- 4LO
This DTC detects an open, short to voltage or short to ground in the motor control A or motor control B circuits or an open or short to ground inside the motor.