OBD Guide
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B1C4D

1st Row Passenger Seat Belt Buckle Tensioner Circuit High

B1C4D is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Seat Belt Buckle Tensioner Circuit High. Common causes: broken or damaged pretensioner wiring harness, oxidation of contacts in connectors. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag malfunction indicator light is on
  • Error message on the dashboard
  • Seat belt pretensioner malfunction

Causes

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

How to Fix

  1. Check the condition of the pretensioner wiring harness and connectors
  2. Measure the resistance of the pretensioner chain
  3. Check the serviceability of the pretensioner squib
  4. If necessary, replace the pretensioner or wiring harness.
  5. Reset the error and check the system

Related codes

B1C4CB1C4EB1C4F

FAQ

What does the B1C4D code mean?

B1C4D is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Seat Belt Buckle Tensioner Circuit High

What causes a B1C4D error code?

The most common causes of B1C4D include: Broken or damaged pretensioner wiring harness; Oxidation of contacts in connectors; Pretensioner squib malfunction; Problems with the airbag control unit.

How do I fix a B1C4D diagnostic trouble code?

To fix B1C4D: Check the condition of the pretensioner wiring harness and connectors. Measure the resistance of the pretensioner chain. Check the serviceability of the pretensioner squib. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C4D?

Do not drive — repair immediately

How much does it cost to fix B1C4D?

The estimated repair cost for B1C4D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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