OBD Guide
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B1237

Short In The Passenger Side Air Mix Control Motor Circuit

B1237 is an OBD-II diagnostic trouble code meaning: Short In The Passenger Side Air Mix Control Motor Circuit. Common causes: wiring harness damage, air mixing 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 temperature control on the passenger side
  • Lack of response to changing climate control settings
  • Uneven temperature distribution in the cabin

Causes

  • Wiring harness damage
  • Air mixing motor malfunction
  • Short circuit in control circuit
  • Problems with the HVAC control unit
  • Oxidation of contacts

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the resistance of the air mixing motor
  3. Inspect contacts and connectors for damage
  4. Check the operation of the HVAC control unit
  5. If necessary, replace the air mixture motor or wiring harness.

Related codes

B1238B1239B1240

FAQ

What does the B1237 code mean?

B1237 is an OBD-II diagnostic trouble code that indicates: Short In The Passenger Side Air Mix Control Motor Circuit

What causes a B1237 error code?

The most common causes of B1237 include: Wiring harness damage; Air mixing motor malfunction; Short circuit in control circuit; Problems with the HVAC control unit.

How do I fix a B1237 diagnostic trouble code?

To fix B1237: Check the integrity of the wiring harness. Check the resistance of the air mixing motor. Inspect contacts and connectors for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1237?

Yes, but get it checked soon

How much does it cost to fix B1237?

The estimated repair cost for B1237 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat