OBD Guide
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B12B0

Front Blower Motor Relay Drive Circuit Open Or Shorted To Ground

B12B0 is an OBD-II diagnostic trouble code meaning: Front Blower Motor Relay Drive Circuit Open Or Shorted To Ground. Common causes: broken or damaged control circuit wires, short circuit to ground. 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 maximum speed
  • Fan fuse blows

Causes

  • Broken or damaged control circuit wires
  • Short circuit to ground
  • Faulty fan relay
  • Problems with the climate control unit
  • Malfunction of the fan itself

How to Fix

  1. Check the fan fuse
  2. Diagnose the control circuit for open circuit and short circuit
  3. Check fan relay
  4. Test the fan operation
  5. If necessary, replace the relay, fan or repair the wiring

Related codes

B12A0B12B1B12B2

FAQ

What does the B12B0 code mean?

B12B0 is an OBD-II diagnostic trouble code that indicates: Front Blower Motor Relay Drive Circuit Open Or Shorted To Ground

What causes a B12B0 error code?

The most common causes of B12B0 include: Broken or damaged control circuit wires; Short circuit to ground; Faulty fan relay; Problems with the climate control unit.

How do I fix a B12B0 diagnostic trouble code?

To fix B12B0: Check the fan fuse. Diagnose the control circuit for open circuit and short circuit. Check fan relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B12B0?

Limited driving only, diagnose soon

How much does it cost to fix B12B0?

The estimated repair cost for B12B0 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat