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Engine-Codes – Generic – B2920

B2920 Code - Auxiliary Mode Door Feedback Circuit Open/Shorted

Quick Answer

The B2920 diagnostic trouble code (DTC) indicates a problem with the auxiliary mode door feedback circuit in the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. Common causes include Wiring issues such as breaks, shorts, or corrosion in the auxiliary mode door feedback circuit, Faulty auxiliary mode door actuator, Defective HVAC control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B2920 indicates Auxiliary Mode Door Feedback Circuit Open/Shorted.
Common causes
Common causes include Wiring issues such as breaks, shorts, or corrosion in the auxiliary mode door feedback circuit, Faulty auxiliary mode door actuator, Defective HVAC control module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B2920 Description

The B2920 diagnostic trouble code (DTC) indicates a problem with the auxiliary mode door feedback circuit in the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. The auxiliary mode door is responsible for directing airflow to specific vents within the vehicle, such as the defroster, floor vents, or dash vents. The feedback circuit is crucial for the system to accurately control the position of the auxiliary mode door based on the driver's settings.

OBDII Code B2920 - Auxiliary Mode Door Feedback Circuit Open/Shorted
B2920 Code - Auxiliary Mode Door Feedback Circuit Open/Shorted

Common Causes of B2920

  1. Wiring issues such as breaks, shorts, or corrosion in the auxiliary mode door feedback circuit
  2. Faulty auxiliary mode door actuator
  3. Defective HVAC control module
  4. Poor electrical connections or loose connectors in the circuit
  5. Damage to the auxiliary mode door itself, preventing it from moving freely

Symptoms of B2920

  1. Uneven airflow distribution from the HVAC vents
  2. Inconsistent temperature output from different vents
  3. HVAC system not responding to control inputs
  4. Unusual noises coming from the HVAC system
  5. Inability to switch between different airflow modes

How to Fix B2920

  1. Begin by diagnosing the exact cause of the issue using a scan tool to read the DTC and pinpoint the problem area.
  2. Inspect the wiring harness and connectors in the auxiliary mode door feedback circuit for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the auxiliary mode door actuator to ensure it is functioning properly. Replace if faulty.
  4. Check the HVAC control module for any faults or malfunctions. Replace if needed.
  5. Clear the DTC and test the HVAC system to verify that the issue has been resolved.

Cost to Fix B2920

The cost of repairing a B2920 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that additional diagnostic time may be needed to pinpoint the exact problem, and rates at dealerships or in metropolitan areas may be higher. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific vehicle.

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Code B2920 Information for Specific Makes

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 B2920 Code

1. What are the common symptoms of OBDII code B2920 (Auxiliary Mode Door Feedback Circuit Open/Shorted)?

- Common symptoms include the inability to control the auxiliary mode door in the HVAC system, inconsistent temperature control, and unusual noises coming from the HVAC unit.

2. What can cause the OBDII code B2920 to trigger?

- The code B2920 can be triggered by a faulty auxiliary mode door actuator, damaged wiring in the feedback circuit, or a short circuit in the system.

3. How can I diagnose the cause of OBDII code B2920?

- Diagnosis involves checking the auxiliary mode door actuator, inspecting the wiring harness for damage or loose connections, and using a multimeter to test the feedback circuit for continuity.

4. Is it safe to continue driving with OBDII code B2920 present?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure proper functioning of the HVAC system.

5. Can I repair OBDII code B2920 on my own?

- Depending on your skill level, you may be able to repair this code on your own by replacing the faulty auxiliary mode door actuator or repairing any damaged wiring in the feedback circuit.

6. How much does it typically cost to repair OBDII code B2920?

- The cost of repairing this code can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any preventive measures to avoid OBDII code B2920 in the future?

- Regularly inspecting and maintaining the HVAC system, checking for any unusual sounds or malfunctions, and addressing any issues promptly can help prevent the recurrence of this code.

8. Can OBDII code B2920 be a recurring problem?

- If the root cause of the issue is not properly addressed during repair, OBDII code B2920 may reoccur. It's important to diagnose and fix the underlying problem to prevent recurrence.

9. What are the implications of ignoring OBDII code B2920?

- Ignoring this code can lead to continued improper functioning of the HVAC system, potentially affecting comfort and safety while driving.

10. Is it necessary to clear OBDII code B2920 after repairing the issue?

- After repairing the underlying problem causing OBDII code B2920, it is recommended to clear the code using an OBDII scanner to reset the system and ensure the issue has been resolved.

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