OBD Guide
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B1C4E

1st Row Passenger Seat Belt Buckle Tensioner Circuit Open

B1C4E is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Seat Belt Buckle Tensioner Circuit Open. Common causes: broken or damaged wiring harness, pretensioner squib malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • SRS/airbag light is on
  • Passenger belt pretensioner not working
  • SRS memory error

Causes

  • Broken or damaged wiring harness
  • Pretensioner squib malfunction
  • Contact corrosion
  • Problems with the SRS control module
  • Mechanical damage to components

How to Fix

  1. Diagnostics of wiring harness and contacts
  2. Checking the Pretensioner Circuit Resistance
  3. Inspect the squib for damage
  4. Checking the SRS control module
  5. Replacing damaged components

Related codes

B1C4DB1C4FB1C50

FAQ

What does the B1C4E code mean?

B1C4E is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Seat Belt Buckle Tensioner Circuit Open

What causes a B1C4E error code?

The most common causes of B1C4E include: Broken or damaged wiring harness; Pretensioner squib malfunction; Contact corrosion; Problems with the SRS control module.

How do I fix a B1C4E diagnostic trouble code?

To fix B1C4E: Diagnostics of wiring harness and contacts. Checking the Pretensioner Circuit Resistance. Inspect the squib for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C4E?

Do not drive — repair immediately

How much does it cost to fix B1C4E?

The estimated repair cost for B1C4E is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat