Conditions for Setting the DTC

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC control module will set this DTC if either of the following conditions are true.

The actuator fails calibration/recalibration due to an over travel or under travel condition. The HVAC control module does not detect the calibrated number of total pulse counts during a travel range check.
The HVAC control module determines that the actual door position does not equal the commanded door position. The HVAC control module commands the door to move but does not see the expected number of pulses between positions.