B1239 Mercury 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 Mercury 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 Mercury Description
What are the Possible Causes of the DTC B1239 Mercury?
- 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 Mercury?
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 Mercury 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 Mercury code?
Need more information on how to fix the B1239 Mercury code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1239 Mercury code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B1239 Mercury Code
1. What are common symptoms of OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- Common symptoms include inconsistent air temperature from the HVAC system, inability to control airflow direction, and unusual clicking or grinding noises from the dashboard area.
2. What are the possible causes of OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- The code may be triggered by a faulty blend door actuator, a damaged blend door, wiring issues, or a malfunctioning HVAC control module.
3. How can I diagnose the cause of OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- Diagnosing the issue typically involves checking the blend door actuator for proper operation, inspecting the blend door for any obstructions, and testing the circuitry for continuity and shorts.
4. Can I continue driving my vehicle with OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential HVAC system malfunctions and discomfort while driving.
5. How can I repair OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- Repair options may include replacing the blend door actuator, repairing damaged wiring, recalibrating the HVAC system, or replacing the blend door itself if necessary.
6. Is it possible to reset OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure) without repairs?
- Resetting the code without addressing the underlying issue may temporarily remove the warning light, but the problem will likely reappear until the root cause is fixed.
7. Are there any preventive maintenance steps to avoid OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- Regularly servicing the HVAC system, checking for unusual noises or airflow issues, and addressing any minor problems promptly can help prevent this code from occurring.
8. Can extreme temperatures or weather conditions contribute to OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- Extreme temperatures or weather conditions can potentially exacerbate existing issues with the blend door actuator or blend door, leading to the triggering of this code.
9. How long does it typically take to repair OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure)?
- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day for diagnostics, parts replacement, and system recalibration.
10. Should I attempt to fix OBDII code B1239 Mercury (Airflow Blend Door Driver Circuit Failure myself, or seek professional help?
- While some DIY enthusiasts may be able to address the issue, it is recommended to consult a professional mechanic or technician for accurate diagnosis and proper repair of this code to ensure long-lasting results.
Discuss the causes and fixes for B1239 Mercury OBDII Code
Code B1239 Mercury comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
