OBD Guide
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C1020

Left Rear Wheel Speed Sensor Circuit

C1020 is an OBD-II diagnostic trouble code meaning: Left Rear Wheel Speed Sensor Circuit. Common causes: broken or damaged sensor wires, wheel speed sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The ABS indicator on the dashboard is on
  • Disabling the ABS system
  • Malfunction of the ESP system
  • Incorrect speedometer readings

Causes

  • Broken or damaged sensor wires
  • Wheel speed sensor malfunction
  • Wiring harness damage
  • Problems with sensor connectors
  • ABS control unit malfunction

How to Fix

  1. Check the integrity of the sensor wires
  2. Check sensor connectors for corrosion or damage.
  3. Replace the wheel speed sensor if necessary
  4. Check sensor resistance
  5. Check the operation of the ABS control unit

Related codes

C1021C1022C1023

FAQ

What does the C1020 code mean?

C1020 is an OBD-II diagnostic trouble code that indicates: Left Rear Wheel Speed Sensor Circuit

What causes a C1020 error code?

The most common causes of C1020 include: Broken or damaged sensor wires; Wheel speed sensor malfunction; Wiring harness damage; Problems with sensor connectors.

How do I fix a C1020 diagnostic trouble code?

To fix C1020: Check the integrity of the sensor wires. Check sensor connectors for corrosion or damage.. Replace the wheel speed sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1020?

Limited driving only, diagnose soon

How much does it cost to fix C1020?

The estimated repair cost for C1020 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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