B0423 BUICK - Temperature Control 2 Feedback
Repair Importance Level:
Repair Difficulty Level:
Possible causes
- Faulty Passenger Air Temperature Actuator
- Passenger Air Temperature Actuator harness is open or shorted
- Passenger Air Temperature Actuator circuit poor electrical connection
Tech notes
DTC B0423 02 - Temperature Control 2 Feedback Circuit Short to GroundDTC B0423 05 - Temperature Control 2 Feedback Circuit Short to Battery or Open
DTC B0423 61 - Temperature Control 2 Circuit Actuator Stuck
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0423 Buick Description
The Heating, Ventilation, and Air Conditioning (HVAC) control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The control circuit uses either a 0, 2.5 or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions.