OBD Guide
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B1238

Problem In The Passenger Side Air Mix Control Linkage, Door, Or Motor Circuit

B1238 is an OBD-II diagnostic trouble code meaning: Problem In The Passenger Side Air Mix Control Linkage, Door, Or Motor Circuit. Common causes: mixer damper jammed, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Incorrect air temperature on the passenger side
  • No response to temperature adjustment
  • Noises when operating the climate control system

Causes

  • Mixer damper jammed
  • Open or short circuit in wiring harness
  • Damper motor malfunction
  • Problems with the climate control unit

How to Fix

  1. Check the mechanical condition of the mixer valve
  2. Check the integrity of the wiring harness and connections
  3. Check the operation of the damper motor
  4. If necessary, replace faulty components
  5. Reset the error and check the system operation

Related codes

B1237B1239B1240

FAQ

What does the B1238 code mean?

B1238 is an OBD-II diagnostic trouble code that indicates: Problem In The Passenger Side Air Mix Control Linkage, Door, Or Motor Circuit

What causes a B1238 error code?

The most common causes of B1238 include: Mixer damper jammed; Open or short circuit in wiring harness; Damper motor malfunction; Problems with the climate control unit.

How do I fix a B1238 diagnostic trouble code?

To fix B1238: Check the mechanical condition of the mixer valve. Check the integrity of the wiring harness and connections. Check the operation of the damper motor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1238?

Yes, but get it checked soon

How much does it cost to fix B1238?

The estimated repair cost for B1238 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat