OBD Guide
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C102A

Left Rear Wheel Speed Comparative Performance

C102A is an OBD-II diagnostic trouble code meaning: Left Rear Wheel Speed Comparative Performance. Common causes: damaged wheel speed sensor, sensor contamination. Estimated repair cost: $56–167.

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

Symptoms

  • ABS/ESP indicator is on
  • Unstable ABS/ESP operation
  • Loss of traction on slippery surfaces

Causes

  • Damaged wheel speed sensor
  • Sensor contamination
  • Ring gear problems
  • Open or short circuit in wiring harness
  • Malfunction of the ABS/ESP control unit

How to Fix

  1. Check the condition of the sensor and ring gear
  2. Clean the sensor from dirt
  3. Check resistance and integrity of wiring harness
  4. Replace the wheel speed sensor if necessary
  5. Check ABS/ESP operation after repair

Related codes

C102BC102CC102D

FAQ

What does the C102A code mean?

C102A is an OBD-II diagnostic trouble code that indicates: Left Rear Wheel Speed Comparative Performance

What causes a C102A error code?

The most common causes of C102A include: Damaged wheel speed sensor; Sensor contamination; Ring gear problems; Open or short circuit in wiring harness.

How do I fix a C102A diagnostic trouble code?

To fix C102A: Check the condition of the sensor and ring gear. Clean the sensor from dirt. Check resistance and integrity of wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C102A?

Do not drive — repair immediately

How much does it cost to fix C102A?

The estimated repair cost for C102A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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