OBD Guide
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B1C4A

1st Row Passenger Retractor Tensioner Circuit Shorted Together

B1C4A is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Retractor Tensioner Circuit Shorted Together. Common causes: wiring harness damage, seat belt pretensioner 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
  • The passive safety system may not work in an accident.

Causes

  • Wiring harness damage
  • Seat belt pretensioner malfunction
  • Problems with the airbag control unit
  • Short circuit in the circuit

How to Fix

  1. Check wiring harness for damage
  2. Check pretensioner chain resistance
  3. Replace pretensioner if necessary
  4. Check the airbag control unit

Related codes

B1C4BB1C4CB1C4D

FAQ

What does the B1C4A code mean?

B1C4A is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Retractor Tensioner Circuit Shorted Together

What causes a B1C4A error code?

The most common causes of B1C4A include: Wiring harness damage; Seat belt pretensioner malfunction; Problems with the airbag control unit; Short circuit in the circuit.

How do I fix a B1C4A diagnostic trouble code?

To fix B1C4A: Check wiring harness for damage. Check pretensioner chain resistance. Replace pretensioner if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C4A?

Do not drive — repair immediately

How much does it cost to fix B1C4A?

The estimated repair cost for B1C4A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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