OBD Guide
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B2920

Auxiliary Mode Door Feedback Circuit Open/Shorted

B2920 is an OBD-II diagnostic trouble code meaning: Auxiliary Mode Door Feedback Circuit Open/Shorted. Common causes: open or short circuit in wiring harness, damper position sensor malfunction. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Incorrect air distribution in the cabin
  • Climate control does not switch airflow modes
  • The damper does not respond to commands

Causes

  • Open or short circuit in wiring harness
  • Damper position sensor malfunction
  • Mechanical jamming of the damper
  • Problems with the climate control unit

How to Fix

  1. Diagnose the damper feedback circuit
  2. Check the resistance and integrity of the position sensor
  3. Inspect the wiring harness for damage
  4. Check the mechanical operation of the damper
  5. Replace faulty components

Related codes

B2921B2922

FAQ

What does the B2920 code mean?

B2920 is an OBD-II diagnostic trouble code that indicates: Auxiliary Mode Door Feedback Circuit Open/Shorted

What causes a B2920 error code?

The most common causes of B2920 include: Open or short circuit in wiring harness; Damper position sensor malfunction; Mechanical jamming of the damper; Problems with the climate control unit.

How do I fix a B2920 diagnostic trouble code?

To fix B2920: Diagnose the damper feedback circuit. Check the resistance and integrity of the position sensor. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2920?

Yes, but get it checked soon

How much does it cost to fix B2920?

The estimated repair cost for B2920 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat