OBD Guide
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B12A1

Passenger Blend Door Actuator Feedback Circuit Shorted To Ground

B12A1 is an OBD-II diagnostic trouble code meaning: Passenger Blend Door Actuator Feedback Circuit Shorted To Ground. Common causes: damage to the wiring in the feedback circuit, mixer damper drive malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Inability to adjust temperature on passenger side
  • Uneven temperature distribution in the cabin
  • Reduced climate control efficiency

Causes

  • Damage to the wiring in the feedback circuit
  • Mixer damper drive malfunction
  • Short circuit in wiring harness
  • Problems with the climate control unit

How to Fix

  1. Check the integrity of the wiring in the feedback circuit
  2. Check the resistance and operation of the mixer damper drive
  3. Inspect the wiring harness for damage
  4. If necessary, replace the drive or repair the wiring
  5. Reset the error and check the system operation

Related codes

B12A2B12A3B12A4

FAQ

What does the B12A1 code mean?

B12A1 is an OBD-II diagnostic trouble code that indicates: Passenger Blend Door Actuator Feedback Circuit Shorted To Ground

What causes a B12A1 error code?

The most common causes of B12A1 include: Damage to the wiring in the feedback circuit; Mixer damper drive malfunction; Short circuit in wiring harness; Problems with the climate control unit.

How do I fix a B12A1 diagnostic trouble code?

To fix B12A1: Check the integrity of the wiring in the feedback circuit. Check the resistance and operation of the mixer damper drive. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B12A1?

Limited driving only, diagnose soon

How much does it cost to fix B12A1?

The estimated repair cost for B12A1 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat