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 try to turn the lock solenoid off by opening the ground circuit.
If the module is unable to de-energize the solenoid, the system will not attempt to de-energize the solenoid again during that ignition cycle.
Transfer Case Lock output reads back as a low voltage when a high voltage is expected.