AutoCodes – Generic – B1239

B1239 Code - Airflow Blend Door Driver Circuit Failure

Quick Answer

When the outside ambient air temperature is cool enough to provide adequate high-voltage battery cooling, the Traction Battery Control Module (TBCM) positions the auxiliary air inlet door actuator in the OPEN position. Common causes include Faulty Auxiliary Air Inlet Mode Door Actuator, Auxiliary Air Inlet Mode Door Actuator harness is open or shorted, Auxiliary Air Inlet Mode Door Actuator circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1239 indicates Airflow Blend Door Driver Circuit Failure.
Common causes: Common causes include Faulty Auxiliary Air Inlet Mode Door Actuator, Auxiliary Air Inlet Mode Door Actuator harness is open or shorted, Auxiliary Air Inlet Mode Door Actuator circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 33,139

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1239 Description

When the outside ambient air temperature is cool enough to provide adequate high-voltage battery cooling, the Traction Battery Control Module (TBCM) positions the auxiliary air inlet door actuator in the OPEN position. If the outside ambient air temperature is too warm to provide adequate High Voltage Traction Battery (HVTB) cooling, the TBCM positions the auxiliary air inlet door actuator in the CLOSED position and requests A/C cooling. The TBCM sends and receives signals to the auxiliary air inlet door actuator on circuits, indicating the position of the auxiliary air inlet door. The TBCM controls the movement of the door by controlling power and ground to the auxiliary air inlet door actuator through circuits.

OBDII Code B1239 - Airflow Blend Door Driver Circuit Failure - AutoCodes.com — B1239 Code - Airflow Blend Door Driver Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1239?

Faulty Auxiliary Air Inlet Mode Door Actuator
Auxiliary Air Inlet Mode Door Actuator harness is open or shorted
Auxiliary Air Inlet Mode Door Actuator circuit poor electrical connection
Faulty Traction Battery Control Module (TBCM)

How to Fix the DTC B1239?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1239 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1239 code?

Need more information on how to fix the B1239 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1239 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1239 Chrysler — PTS Sensor 9 Ring Time Too Long
B1239 Dodge — PTS Sensor 9 Ring Time Too Long
B1239 Ford — Airflow Blend Door Driver Circuit Failure
B1239 Jeep — PTS Sensor 9 Ring Time Too Long
B1239 Lincoln — Airflow Blend Door Driver Circuit Failure
B1239 Mercury — Airflow Blend Door Driver Circuit Failure
B1239 RAM — PTS Sensor 9 Ring Time Too Long

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1239 Code

1. What are the common symptoms of OBDII code B1239 (Airflow Blend Door Driver Circuit Failure)?

When the airflow blend door driver circuit fails, common symptoms include inconsistent airflow from the HVAC vents, difficulty adjusting the temperature, and unusual noises coming from the heating or cooling system.

2. What are the possible causes of OBDII code B1239?

The most common causes of OBDII code B1239 include a faulty blend door actuator, damaged wiring or connectors in the airflow blend door circuit, or a malfunctioning HVAC control module.

3. How do I diagnose OBDII code B1239?

Diagnosing OBDII code B1239 typically involves using a scan tool to retrieve the specific fault code, checking the blend door actuator for proper operation, inspecting the wiring and connectors for damage, and testing the HVAC control module for functionality.

4. Can I continue driving my vehicle with OBDII code B1239?

While it may be possible to continue driving your vehicle with OBDII code B1239, it is recommended to address the issue promptly to avoid potential discomfort from inconsistent heating or cooling and prevent further damage to the HVAC system.

5. How can I repair OBDII code B1239?

Repairing OBDII code B1239 usually involves replacing the faulty blend door actuator, repairing or replacing damaged wiring or connectors, or reprogramming the HVAC control module as necessary.

6. Are there any DIY tips for fixing OBDII code B1239?

DIY enthusiasts may attempt to replace the blend door actuator themselves by following online guides or service manuals. However, it is crucial to have the necessary tools and skills to avoid causing further damage to the HVAC system.

7. How much does it typically cost to repair OBDII code B1239?

The cost of repairing OBDII code B1239 can vary depending on the specific cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic. In general, expect to pay anywhere from $100 to $500 for parts and labor.

8. Can OBDII code B1239 be a recurring issue?

If the root cause of OBDII code B1239 is not properly addressed during the repair process, it is possible for the issue to recur. Regular maintenance of the HVAC system and addressing any related problems promptly can help prevent the code from reappearing.

9. Is OBDII code B1239 specific to a certain make or model of vehicle?

OBDII code B1239 (Airflow Blend Door Driver Circuit Failure) can be found in various vehicle makes and models equipped with an onboard diagnostics system. However, the specific repair procedures and components may vary between different vehicles.

10. Can OBDII code B1239 affect the overall performance of the vehicle?

While OBDII code B1239 is primarily related to the HVAC system's airflow blend door circuit, neglecting to address the issue can lead to discomfort for the driver and passengers. Additionally, a malfunctioning HVAC system may impact the overall comfort and convenience of the vehicle.