OBD Guide
ENFRDEESPT

C100A

Left Front Wheel Speed Sensor Circuit

C100A is an OBD-II diagnostic trouble code meaning: Left Front Wheel Speed Sensor Circuit. Common causes: wheel speed sensor malfunction, open or shorted wiring harness. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • The ABS/ESP indicator on the dashboard is on
  • Disabling the ABS/ESP system
  • Incorrect operation of the stabilization system
  • Errors in cruise control operation (if any)

Causes

  • Wheel speed sensor malfunction
  • Open or shorted wiring harness
  • Poor contact in the sensor connector
  • Damage to the ring gear on the hub
  • ABS control unit malfunction

How to Fix

  1. Visual inspection of the sensor and wiring harness
  2. Checking the sensor resistance
  3. Checking continuity with a multimeter
  4. Cleaning the sensor connector contacts
  5. Replace the sensor if necessary
  6. Checking the condition of the ring gear on the hub

Related codes

C100BC100CC100D

FAQ

What does the C100A code mean?

C100A is an OBD-II diagnostic trouble code that indicates: Left Front Wheel Speed Sensor Circuit

What causes a C100A error code?

The most common causes of C100A include: Wheel speed sensor malfunction; Open or shorted wiring harness; Poor contact in the sensor connector; Damage to the ring gear on the hub.

How do I fix a C100A diagnostic trouble code?

To fix C100A: Visual inspection of the sensor and wiring harness. Checking the sensor resistance. Checking continuity with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C100A?

Limited driving only, diagnose soon

How much does it cost to fix C100A?

The estimated repair cost for C100A is $33–89. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat