OBD Guide
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B1C4F

1st Row Passenger Seat Belt Buckle Tensioner Circuit Shorted Together

B1C4F is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Seat Belt Buckle Tensioner Circuit Shorted Together. Common causes: wiring harness damage, short circuit in pretensioner circuit. 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 does not activate
  • Diagnostic memory error

Causes

  • Wiring harness damage
  • Short circuit in pretensioner circuit
  • Oxidation of contacts
  • Pretensioner malfunction

How to Fix

  1. Check pretensioner chain resistance
  2. Inspect the wiring harness for damage
  3. Clean contacts from oxides
  4. Replace pretensioner if necessary
  5. Reset the error and check the system operation

Related codes

B1C4EB1C50B1C51

FAQ

What does the B1C4F code mean?

B1C4F is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Seat Belt Buckle Tensioner Circuit Shorted Together

What causes a B1C4F error code?

The most common causes of B1C4F include: Wiring harness damage; Short circuit in pretensioner circuit; Oxidation of contacts; Pretensioner malfunction.

How do I fix a B1C4F diagnostic trouble code?

To fix B1C4F: Check pretensioner chain resistance. Inspect the wiring harness for damage. Clean contacts from oxides. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C4F?

Do not drive — repair immediately

How much does it cost to fix B1C4F?

The estimated repair cost for B1C4F is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat