OBD Guide
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B1239

Airflow Blend Door Driver Circuit Failure

B1239 is an OBD-II diagnostic trouble code meaning: Airflow Blend Door Driver Circuit Failure. Common causes: open or short circuit in wiring harness, damper motor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of climate control
  • The temperature in the cabin does not correspond to the set temperature
  • Lack of response to changing temperature settings

Causes

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

How to Fix

  1. Check the wiring harness for breaks and short circuits
  2. Check the operation of the damper motor
  3. Inspect the damper mechanism for jamming
  4. If necessary, replace faulty components
  5. Reset the error and check the system operation

Related codes

B1240B1241B1242

FAQ

What does the B1239 code mean?

B1239 is an OBD-II diagnostic trouble code that indicates: Airflow Blend Door Driver Circuit Failure

What causes a B1239 error code?

The most common causes of B1239 include: Open or short circuit in wiring harness; Damper motor malfunction; Problems in the climate control control unit; Mechanical jamming of the damper.

How do I fix a B1239 diagnostic trouble code?

To fix B1239: Check the wiring harness for breaks and short circuits. Check the operation of the damper motor. Inspect the damper mechanism for jamming. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1239?

Yes, but get it checked soon

How much does it cost to fix B1239?

The estimated repair cost for B1239 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat