OBD Guide
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B1BBC

Occupant Classification Seat Negative System Weight

B1BBC is an OBD-II diagnostic trouble code meaning: Occupant Classification Seat Negative System Weight. Common causes: malfunction of weight sensors in the seat, wiring harness damage. 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 system does not detect the passenger's weight
  • Airbag turns off for no reason

Causes

  • Malfunction of weight sensors in the seat
  • Wiring harness damage
  • Problems with the airbag control unit
  • System calibration is not performed correctly

How to Fix

  1. Check error codes in the SRS system
  2. Inspect the sensors and wiring in the seat
  3. Check connections and contacts
  4. Replace sensors or wiring harness if necessary
  5. Perform system calibration

Related codes

B1BB9B1BBAB1BBB

FAQ

What does the B1BBC code mean?

B1BBC is an OBD-II diagnostic trouble code that indicates: Occupant Classification Seat Negative System Weight

What causes a B1BBC error code?

The most common causes of B1BBC include: Malfunction of weight sensors in the seat; Wiring harness damage; Problems with the airbag control unit; System calibration is not performed correctly.

How do I fix a B1BBC diagnostic trouble code?

To fix B1BBC: Check error codes in the SRS system. Inspect the sensors and wiring in the seat. Check connections and contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1BBC?

Do not drive — repair immediately

How much does it cost to fix B1BBC?

The estimated repair cost for B1BBC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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