Conditions for Setting the DTC

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 system will test the motor circuits:
- First, the system checks for unwanted voltage.
- Then, the system supplies voltage on one circuit and reads the voltage back on the other.
If the system detects a problem with the circuits, the DTC is logged.
The transfer case shift control module senses a low voltage return in Motor Control A or Motor Control B when a high voltage is expected.