AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Buick - B0239 BUICK

B0239 BUICK Code - Air Flow Control 1 Circuit Performance

- Code Popularity: 290 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents
By AutoCodes.com - Updated Mar 10, 2021
Share on Facebook   Share on Twitter   Share on Linkedin

|B0239 BUICK code possible causes

  • Faulty Defrost Actuator
  • Defrost Actuator harness is open or shorted
  • Defrost Actuator circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

|How do I fix code B0239 BUICK code?

Check 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.

|Cost of diagnosing B0239 BUICK code

Labor: 1.0

The cost of diagnosing the B0239 BUICK code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are B0239 BUICK code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|B0239 BUICK code description

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the HVAC actuators to regulate the airflow and temperature through the HVAC system. The actuators are 2 wire, bi-directional electric motors that share the same common control circuit. When the operator adjusts the actuators, the control module can only operate one actuator at a time due to the shared common control circuit. The control circuits use either a 0 or 12-volt value to co-ordinate the actuator movement. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.
The HVAC control module determines the door position by counting motor pulses on one of the control circuits. The HVAC control module converts the pulses to counts with a range of 0-255 counts.
When a calibration or recalibration procedure is performed, the HVAC control module calculates the door travel range. The HVAC control module compares the total number of pulses to calibrated limits. If the total pulse count is less than or equal to the maximum calibrated limited and more that or equal to the minimum calibrated limit, then the calibration is considered successful.

OBDII Code B0239 Buick - Air Flow Control 1 Circuit Performance - AutoCodes.com
B0239 BUICK Code - Air Flow Control 1 Circuit Performance

|Need more information with the B0239 BUICK code?

Need more information on how to fix the B0239 BUICK code?
Get Access to Factory Service Manuals

|Need help with a B0239 BUICK code?

Get the B0239 Buick code diagnosed by a professional: Find a repair shop in your area

|B0239 BUICK code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B0239 Buick code? Have you replaced any parts?
Any information is appreciated. Thanks