B1239 Ford 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 Ford 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.
Code B1239 Ford Description
What are the Possible Causes of the DTC B1239 Ford?
- 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 Ford?
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 Ford 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.
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Frequently Asked Questions about B1239 Ford Code
1. What does OBDII code B1239 mean for a Ford vehicle?
Code B1239 indicates a failure in the Airflow Blend Door Driver Circuit, which controls the blend door used to regulate airflow temperature in the HVAC system.
2. What are the symptoms of code B1239 on a Ford?
Common symptoms include inconsistent cabin temperature, inability to change between hot and cold air, or unusual noises coming from the HVAC system.
3. What causes the B1239 code to trigger?
The code can be caused by a faulty blend door actuator, damaged wiring or connectors in the blend door circuit, or a failure in the HVAC control module.
4. Can a stuck blend door cause the B1239 code?
Yes, a stuck or jammed blend door can put excess strain on the actuator, causing the circuit to fail and triggering the B1239 code.
5. How can I diagnose the B1239 code?
Start by inspecting the blend door actuator for damage or wear, checking the circuit wiring and connectors for faults, and using a scan tool to test the HVAC control module functionality.
6. Is it safe to drive with the B1239 code present?
Yes, but you may experience discomfort due to the inability to control cabin temperature. It’s best to address the issue promptly to avoid further damage to the HVAC system.
7. How do you fix the B1239 code on a Ford vehicle?
Repairs may include replacing the blend door actuator, repairing or replacing damaged wiring, or reprogramming or replacing the HVAC control module if necessary.
8. How much does it cost to fix the B1239 code?
The cost can range from $150 to $500 depending on whether you need to replace the blend door actuator, repair wiring, or address control module issues.
9. Can a software update fix the B1239 code?
In some cases, a software update for the HVAC control module may resolve the issue if it’s related to a programming bug.
10. How can I prevent the B1239 code from recurring?
Regularly inspect and maintain the HVAC system, ensure proper actuator operation, and address any unusual HVAC noises or airflow issues promptly.
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