OBD Guide
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B140D

Second Row Passenger Side Seatbelt Sensor Circuit

B140D is an OBD-II diagnostic trouble code meaning: Second Row Passenger Side Seatbelt Sensor Circuit. Common causes: open or short circuit in the sensor circuit, seat belt sensor malfunction. 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 passive safety system may not work in the event of an accident.
  • An error may appear when checking with an OBD-II scanner

Causes

  • Open or short circuit in the sensor circuit
  • Seat belt sensor malfunction
  • Wiring harness damage
  • Software failure in the airbag control unit

How to Fix

  1. Check the continuity of the seat belt sensor circuit
  2. Inspect the wiring harness for damage
  3. Replace the seat belt sensor if necessary
  4. Check and update the airbag control unit software

Related codes

B140CB140EB140F

FAQ

What does the B140D code mean?

B140D is an OBD-II diagnostic trouble code that indicates: Second Row Passenger Side Seatbelt Sensor Circuit

What causes a B140D error code?

The most common causes of B140D include: Open or short circuit in the sensor circuit; Seat belt sensor malfunction; Wiring harness damage; Software failure in the airbag control unit.

How do I fix a B140D diagnostic trouble code?

To fix B140D: Check the continuity of the seat belt sensor circuit. Inspect the wiring harness for damage. Replace the seat belt sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B140D?

Do not drive — repair immediately

How much does it cost to fix B140D?

The estimated repair cost for B140D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat