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

Quick Answer

The B2920 diagnostic trouble code for Lincoln vehicles refers to an issue with the Auxiliary Mode Door Feedback Circuit being open or shorted. Common causes include Faulty auxiliary mode door actuator, Wiring issues such as a short or open circuit, Blown fuse related to the auxiliary mode door circuit. 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 Lincoln indicates Auxiliary Mode Door Feedback Circuit Open/Shorted.
Common causes
Common causes include Faulty auxiliary mode door actuator, Wiring issues such as a short or open circuit, Blown fuse related to the auxiliary mode door circuit.
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 17, 2024
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Code B2920 Lincoln Description

The B2920 diagnostic trouble code for Lincoln vehicles refers to an issue with the Auxiliary Mode Door Feedback Circuit being open or shorted. The auxiliary mode door is a component of the HVAC (Heating, Ventilation, and Air Conditioning) system in the vehicle that controls the direction of airflow within the cabin. The feedback circuit is responsible for providing information to the vehicle's computer about the position of the auxiliary mode door. When this circuit is open or shorted, it means that the computer is not receiving the correct feedback signal, which can lead to improper operation of the HVAC system.

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

Common Causes of B2920 Lincoln

  1. Faulty auxiliary mode door actuator
  2. Wiring issues such as a short or open circuit
  3. Blown fuse related to the auxiliary mode door circuit
  4. Defective HVAC control module
  5. Corrosion or damage to electrical connectors

Symptoms of B2920 Lincoln

  1. Inconsistent airflow from the HVAC vents
  2. Inability to control the direction of airflow (e.g., defrost, floor, dash vents)
  3. Unusual noises coming from the HVAC system
  4. HVAC system not responding to control inputs
  5. Reduced heating or cooling effectiveness

How to Fix B2920 Lincoln

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the trouble codes and testing the auxiliary mode door actuator and related components.
  2. Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  3. Check and replace any blown fuses related to the auxiliary mode door circuit.
  4. Test the auxiliary mode door actuator for proper operation and replace it if necessary.
  5. Clear the trouble codes from the vehicle's computer and test the HVAC system to ensure proper functionality.

Cost to Fix B2920 Lincoln

The typical repair costs for addressing the B2920 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts such as a new auxiliary mode door actuator and any necessary wiring harness or fuses can range from $100 to $300. The labor cost for diagnosing and repairing the problem can add an additional $150 to $300. Overall, the total repair cost for this issue may fall within the range of $250 to $600. However, it's important to note that these are rough estimates, and actual costs may vary based on the location, vehicle make and model, and the rates charged by the auto repair shop. It's recommended to obtain quotes from local shops for a more accurate cost estimate.

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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 Lincoln Code

1. What are the common symptoms of OBDII code B2920 Lincoln?

The common symptoms of OBDII code B2920 Lincoln, Auxiliary Mode Door Feedback Circuit Open/Shorted, include issues with the heating, ventilation, and air conditioning (HVAC) system, such as improper air distribution or temperature control.

2. What causes the OBDII code B2920 Lincoln to trigger?

The OBDII code B2920 Lincoln is triggered when there is an open or short circuit in the auxiliary mode door feedback circuit, which is responsible for controlling the position of the mode door in the HVAC system.

3. How can I diagnose the Auxiliary Mode Door Feedback Circuit issue?

Diagnosing the Auxiliary Mode Door Feedback Circuit issue involves conducting a thorough inspection of the wiring harness, connectors, and components related to the mode door feedback circuit. Using a multimeter to test for continuity and voltage can help pinpoint the location of the open or short circuit.

4. Can I drive my Lincoln with the B2920 code present?

It is not recommended to drive your Lincoln with the B2920 code present, as it can affect the proper functioning of the HVAC system, leading to discomfort and potential safety issues due to improper defrosting or heating.

5. How can I repair the Auxiliary Mode Door Feedback Circuit issue?

Repairing the Auxiliary Mode Door Feedback Circuit issue involves locating and repairing the open or short circuit in the wiring harness, connectors, or components. This may require replacing damaged wiring, repairing connectors, or replacing faulty components.

6. Is it possible to reset the B2920 code without fixing the issue?

While you can clear the B2920 code using an OBDII scanner, it is not recommended to do so without addressing the underlying problem, as the issue will persist and potentially worsen over time.

7. Are there any DIY tips for fixing the B2920 code?

DIY tips for fixing the B2920 code include carefully inspecting the wiring harness for damage, ensuring all connectors are securely attached, and following a systematic approach to tracing and repairing the open or short circuit in the Auxiliary Mode Door Feedback Circuit.

8. How much does it cost to repair the B2920 code in a Lincoln?

The cost of repairing the B2920 code in a Lincoln can vary depending on the extent of the damage, the specific components that need to be replaced, and whether the repair is done at a dealership or an independent mechanic. It is advisable to get a few quotes from different repair shops.

9. Is the B2920 code a common issue in Lincoln vehicles?

The B2920 code related to the Auxiliary Mode Door Feedback Circuit is not as common as some other OBDII codes, but it can still occur in Lincoln vehicles, especially in older models or those with a history of HVAC system problems.

10. Can a faulty Auxiliary Mode Door Feedback Circuit impact other systems in the vehicle?

A faulty Auxiliary Mode Door Feedback Circuit can impact the overall performance of the HVAC system, affecting air distribution and temperature control. While it may not directly impact other vehicle systems, it can lead to discomfort and reduced visibility if not addressed promptly.

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