OBD Guide
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B1234

Short In The Driver Side Air Mix Control Motor Circuit

B1234 is an OBD-II diagnostic trouble code meaning: Short In The Driver Side Air Mix Control Motor Circuit. Common causes: wiring harness damage, malfunction of the air mixture adjustment motor. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–111 (est.)

Symptoms

  • Inability to adjust air temperature on the driver's side
  • Incorrect operation of the climate system
  • Hot or cold air is supplied without the possibility of adjustment

Causes

  • Wiring harness damage
  • Malfunction of the air mixture adjustment motor
  • Problems with the climate control unit
  • Short circuit in the motor power supply circuit

How to Fix

  1. Check the wiring harness for damage
  2. Check the operation of the air mixture adjustment motor
  3. Check the climate control unit
  4. Replace faulty components

Related codes

B1235B1236

FAQ

What does the B1234 code mean?

B1234 is an OBD-II diagnostic trouble code that indicates: Short In The Driver Side Air Mix Control Motor Circuit

What causes a B1234 error code?

The most common causes of B1234 include: Wiring harness damage; Malfunction of the air mixture adjustment motor; Problems with the climate control unit; Short circuit in the motor power supply circuit.

How do I fix a B1234 diagnostic trouble code?

To fix B1234: Check the wiring harness for damage. Check the operation of the air mixture adjustment motor. Check the climate control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1234?

Do not drive — repair immediately

How much does it cost to fix B1234?

The estimated repair cost for B1234 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat