OBD Guide
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B129C

Left Front Side Sensor Circuit Short To Ground Or Open

B129C is an OBD-II diagnostic trouble code meaning: Left Front Side Sensor Circuit Short To Ground Or Open. Common causes: wiring harness damage, sensor malfunction. 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 passive safety system does not activate
  • Error B129C in diagnostic scanner memory

Causes

  • Wiring harness damage
  • Sensor malfunction
  • Poor contact in the connector
  • Short circuit to ground
  • Open circuit

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect the sensor connectors for oxidation or damage.
  3. Check sensor resistance
  4. Replace sensor if necessary
  5. Clean or replace connectors
  6. Reset the error and check the system

Related codes

B129DB129EB129F

FAQ

What does the B129C code mean?

B129C is an OBD-II diagnostic trouble code that indicates: Left Front Side Sensor Circuit Short To Ground Or Open

What causes a B129C error code?

The most common causes of B129C include: Wiring harness damage; Sensor malfunction; Poor contact in the connector; Short circuit to ground.

How do I fix a B129C diagnostic trouble code?

To fix B129C: Check the integrity of the wiring harness. Inspect the sensor connectors for oxidation or damage.. Check sensor resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B129C?

Do not drive — repair immediately

How much does it cost to fix B129C?

The estimated repair cost for B129C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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