OBD Guide
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B1B1A

Left Side Curtain Squib 1 Circuit Open

B1B1A is an OBD-II diagnostic trouble code meaning: Left Side Curtain Squib 1 Circuit Open. Common causes: broken or damaged wires in the harness, curtain air squib malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • SRS system does not pass self-diagnosis
  • The curtain airbag may not deploy in an accident.

Causes

  • Broken or damaged wires in the harness
  • Curtain air squib malfunction
  • Contact corrosion
  • Problems with the SRS control unit

How to Fix

  1. Check the integrity of the wiring harness to the left curtain airbag
  2. Check the resistance of the squib (should be within 2-5 Ohms)
  3. Inspect contacts for corrosion
  4. If necessary, replace the squib or wiring harness.
  5. Reset the error and check the system

Related codes

B1B1BB1B1CB1B1D

FAQ

What does the B1B1A code mean?

B1B1A is an OBD-II diagnostic trouble code that indicates: Left Side Curtain Squib 1 Circuit Open

What causes a B1B1A error code?

The most common causes of B1B1A include: Broken or damaged wires in the harness; Curtain air squib malfunction; Contact corrosion; Problems with the SRS control unit.

How do I fix a B1B1A diagnostic trouble code?

To fix B1B1A: Check the integrity of the wiring harness to the left curtain airbag. Check the resistance of the squib (should be within 2-5 Ohms). Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B1A?

Do not drive — repair immediately

How much does it cost to fix B1B1A?

The estimated repair cost for B1B1A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat