Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
On certain Volkswagen vehicles, when using a generic scan tool while diagnosing model year 1999 vehicles equipped with a 2.0L engine, an incorrect DTC B0423 may be displayed by itself or along with P1176 (17584). This incorrectly displayed DTC has the same meaning as P1176 (17584) and therefore P1176 (17584) diagnostics should be followed to correctly repair the vehicle.
The cost to diagnose the B0423 VOLKSWAGEN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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.
Need more information on how to fix the B0423 VOLKSWAGEN code?
Get Access to Factory Service Manuals
Get the b0423 volkswagen code diagnosed by a professional: Find a repair shop in your area