OBD Guide
ENFRDEESPT

B1B2A

1st Row Driver Seat Belt Pretensioner Circuit Open

B1B2A is an OBD-II diagnostic trouble code meaning: 1st Row Driver Seat Belt Pretensioner Circuit Open. Common causes: broken wires in the srs system harness, oxidation or corrosion of contacts. Estimated repair cost: $56–167.

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

Symptoms

  • SRS/airbag indicator is on
  • Security error message on dashboard
  • The pretensioner does not work during diagnostics

Causes

  • Broken wires in the SRS system harness
  • Oxidation or corrosion of contacts
  • Pretensioner squib malfunction
  • Damage to connectors
  • SRS control unit defective

How to Fix

  1. Visual inspection of pretensioner wiring harness and connectors
  2. Checking circuit continuity with a multimeter
  3. Diagnostics of squib resistance (usually 2-4 Ohms)
  4. Cleaning contacts or replacing connectors if necessary
  5. Pretensioner replacement or harness repair
  6. Resetting the error using the SRS scanner

Related codes

B1B29B1B2BB1B20

FAQ

What does the B1B2A code mean?

B1B2A is an OBD-II diagnostic trouble code that indicates: 1st Row Driver Seat Belt Pretensioner Circuit Open

What causes a B1B2A error code?

The most common causes of B1B2A include: Broken wires in the SRS system harness; Oxidation or corrosion of contacts; Pretensioner squib malfunction; Damage to connectors.

How do I fix a B1B2A diagnostic trouble code?

To fix B1B2A: Visual inspection of pretensioner wiring harness and connectors. Checking circuit continuity with a multimeter. Diagnostics of squib resistance (usually 2-4 Ohms). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B2A?

Do not drive — repair immediately

How much does it cost to fix B1B2A?

The estimated repair cost for B1B2A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat