Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 GMC Yukon, 2009 Chevrolet Tahoe, 2009 Chevrolet Suburban, and 2009 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

This DTC sets if the front axle actuator switch shows battery voltage when the actuator is disengaged, or when the front axle actuator shows no voltage when the actuator is engaged.
The module also monitors the axle actuator control circuit and sets the DTC if a high voltage is expected (disengaged) and a low voltage is seen. It will also set when a low voltage is expected (engaged) and a high voltage is seen.