2007 Chevrolet Impala LT 3.5L
Customer states that battery goes dead while vehicle is sitting
Diagnostic Steps Performed/Parts Replaced
Performed Charging system test and all is normal. Shortly after the test, while looking for loose wiring, a clicking noise was found and appeared to be moving throughout the dash in a cycle. The temperature control doors were clicking, attempting to move, but were in fact stuck to one extreme. Scanned the HVAC system and retrieved 3 codes:
B0223 Recirculate Position Command Circuit Actuator Stuck
B0408 Left Air Mix Control Circuit Malfunction Actuator Stuck
B0418 Temperature Control 2 Circuit Actuator stuck
Cannot command the motors — replaced 2 of the motors and still cannot command them. Internal failure of the controller causing motors to run with key removed, thus, draining battery.
Replaced HVAC control module and three bad mode door actuators. No more clicking noise and battery not draining with key off.
Courtesy of Mitchell 1 SureTrack Real Fix