OBD Guide
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B1B12

Driver Knee Bolster Squib Circuit Open

B1B12 is an OBD-II diagnostic trouble code meaning: Driver Knee Bolster Squib Circuit Open. Common causes: broken or damaged wiring harness, oxidation of contacts in connectors. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system does not work

Causes

  • Broken or damaged wiring harness
  • Oxidation of contacts in connectors
  • Squib malfunction
  • Problems with the airbag control unit

How to Fix

  1. Check the integrity of the wiring harness
  2. Clean contacts in connectors
  3. Measure the resistance of the squib
  4. Replace damaged components
  5. Reset the error and check the system

Related codes

B1B11B1B13B1B14

FAQ

What does the B1B12 code mean?

B1B12 is an OBD-II diagnostic trouble code that indicates: Driver Knee Bolster Squib Circuit Open

What causes a B1B12 error code?

The most common causes of B1B12 include: Broken or damaged wiring harness; Oxidation of contacts in connectors; Squib malfunction; Problems with the airbag control unit.

How do I fix a B1B12 diagnostic trouble code?

To fix B1B12: Check the integrity of the wiring harness. Clean contacts in connectors. Measure the resistance of the squib. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B12?

Limited driving only, diagnose soon

How much does it cost to fix B1B12?

The estimated repair cost for B1B12 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat