OBD Guide
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B10AF

Blower Fan Relay Circuit

B10AF is an OBD-II diagnostic trouble code meaning: Blower Fan Relay Circuit. Common causes: faulty fan relay, open or short circuit in wiring harness. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Heater fan does not work
  • The fan only runs at one speed
  • Extraneous noise during fan operation

Causes

  • Faulty fan relay
  • Open or short circuit in wiring harness
  • Faulty fan motor
  • Problems with the HVAC control unit
  • Blown fuse

How to Fix

  1. Check the condition of the fan circuit fuse
  2. Check fan relay operation
  3. Check the integrity of the wiring harness
  4. Check the operation of the fan motor
  5. If necessary, replace faulty components

Related codes

B10B0B10B1B10AE

FAQ

What does the B10AF code mean?

B10AF is an OBD-II diagnostic trouble code that indicates: Blower Fan Relay Circuit

What causes a B10AF error code?

The most common causes of B10AF include: Faulty fan relay; Open or short circuit in wiring harness; Faulty fan motor; Problems with the HVAC control unit.

How do I fix a B10AF diagnostic trouble code?

To fix B10AF: Check the condition of the fan circuit fuse. Check fan relay operation. Check the integrity of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B10AF?

Limited driving only, diagnose soon

How much does it cost to fix B10AF?

The estimated repair cost for B10AF is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat