OBD Guide
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B1B54

1st Row Passenger Seat Belt Sensor Circuit Low

B1B54 is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Seat Belt Sensor Circuit Low. Common causes: seat belt sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • The system may not take into account a seatbelt passenger.
  • Possible false alarms of the security system

Causes

  • Seat belt sensor malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Problems with the airbag control unit

How to Fix

  1. Check the integrity of the wiring harness to the seat belt sensor
  2. Inspect the sensor connectors for corrosion or damage.
  3. Check the resistance of the seat belt sensor
  4. If necessary, replace the sensor or repair the wiring harness
  5. Reset the error and check if it returns

Related codes

B1B55B1B56B1B57

FAQ

What does the B1B54 code mean?

B1B54 is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Seat Belt Sensor Circuit Low

What causes a B1B54 error code?

The most common causes of B1B54 include: Seat belt sensor malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Problems with the airbag control unit.

How do I fix a B1B54 diagnostic trouble code?

To fix B1B54: Check the integrity of the wiring harness to the seat belt sensor. Inspect the sensor connectors for corrosion or damage.. Check the resistance of the seat belt sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B54?

Do not drive — repair immediately

How much does it cost to fix B1B54?

The estimated repair cost for B1B54 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat