B2920 Code - Auxiliary Mode Door Feedback Circuit Open/Shorted
Quick Answer
Under normal operation, to rotate the auxiliary temperature blend door actuator clockwise, the Smart Junction Box (SJB) supplies voltage to the auxiliary temperature blend door actuator motors through the circuit and supplies ground through the circuit. Common causes include Faulty Auxiliary Temperature Mode Door Actuator, Auxiliary Temperature Mode Door Actuator harness is open or shorted, Auxiliary Temperature Mode Door Actuator circuit poor electrical connection. 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 Faulty Auxiliary Temperature Mode Door Actuator, Auxiliary Temperature Mode Door Actuator harness is open or shorted, Auxiliary Temperature Mode Door Actuator circuit poor electrical connection.
- 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.
Code B2920 Description
The auxiliary temperature blend door actuator feedback resistor is supplied a ground from the SJB through the circuit and a 5-volt reference voltage on a circuit. The SJB reads the voltage on the auxiliary temperature blend door actuator feedback circuit to determine the auxiliary temperature blend door actuator position by the position of the actuator feedback resistor wiper arm.
What are the Possible Causes of the DTC B2920?
- Faulty Auxiliary Temperature Mode Door Actuator
- Auxiliary Temperature Mode Door Actuator harness is open or shorted
- Auxiliary Temperature Mode Door Actuator circuit poor electrical connection
- Faulty Smart Junction Box (SJB)
How to Fix the DTC B2920?
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 B2920 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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Information for Specific Makes
- B2920 Ford — Auxiliary Mode Door Feedback Circuit Open/Shorted
- B2920 Lincoln — Auxiliary Mode Door Feedback Circuit Open/Shorted
- B2920 Mercury — Auxiliary Mode Door Feedback Circuit Open/Shorted
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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