OBD Guide
ENFRDEESPT

B140C

Second Row Driver Side Seatbelt Sensor Circuit

B140C is an OBD-II diagnostic trouble code meaning: Second Row Driver Side Seatbelt Sensor Circuit. Common causes: open or short circuit in wiring harness, 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 does not work correctly
  • Error in diagnostic system

Causes

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

How to Fix

  1. Check the wiring harness for breaks and short circuits
  2. Check the contacts in the sensor connectors
  3. Replace the seat belt sensor if necessary
  4. Check the airbag control unit

Related codes

B140DB140BB140A

FAQ

What does the B140C code mean?

B140C is an OBD-II diagnostic trouble code that indicates: Second Row Driver Side Seatbelt Sensor Circuit

What causes a B140C error code?

The most common causes of B140C include: Open or short circuit in wiring harness; Seat belt sensor malfunction; Poor contact in connectors; Problems with the airbag control unit.

How do I fix a B140C diagnostic trouble code?

To fix B140C: Check the wiring harness for breaks and short circuits. Check the contacts in the sensor connectors. Replace the seat belt sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B140C?

Do not drive — repair immediately

How much does it cost to fix B140C?

The estimated repair cost for B140C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat