C0061 DTC: Left Rear Wheel Speed Sensor Performance
What Does C0061 Mean?
Diagnostic Trouble Code (DTC) C0061 indicates that the ABS control module has detected a performance problem with the left rear wheel speed sensor. Although the sensor circuit may be electrically functional, the sensor output is inaccurate, unstable, or inconsistent compared with the signals from the other wheel speed sensors. This condition can reduce the effectiveness of the Anti-lock Braking System (ABS), Traction Control System (TCS), and Electronic Stability Control (ESC).
Symptoms
- ABS warning light illuminated
- Traction Control (TCS) warning light ON
- Electronic Stability Control (ESC) warning light
- Unexpected ABS activation at low speeds
- Reduced braking stability on slippery roads
- Cruise control may be disabled on some vehicles
- Additional ABS-related DTCs stored
Common Causes
- Faulty left rear wheel speed sensor
- Damaged or cracked tone ring (reluctor ring)
- Incorrect sensor air gap
- Wheel bearing wear or excessive play
- Metal debris attached to the magnetic sensor
- Damaged wiring harness
- Loose or corroded electrical connector
- Faulty ABS control module (rare)
Typical Diagnostic Flow
How to Diagnose C0061
- Read ABS trouble codes using a professional scan tool.
- Monitor live wheel speed data while driving.
- Compare the left rear wheel speed with the remaining wheel speed sensors.
- Inspect the tone ring for cracks, rust, or missing teeth.
- Verify the sensor air gap according to manufacturer specifications.
- Inspect the wheel bearing for excessive movement.
- Check the wiring harness and connector for corrosion or physical damage.
- Remove any metal particles attached to the magnetic sensor.
Typical Values
- All wheel speed sensors should report nearly identical speeds while driving in a straight line.
- Irregular or unstable readings usually indicate a sensor performance problem.
- Actual specifications vary depending on the vehicle manufacturer.
Estimated Repair Cost
- Wheel speed sensor replacement: $70–250
- Wiring repair: $50–200
- Connector replacement: $30–120
- Tone ring replacement: $80–300
- Wheel bearing replacement: $150–500
- ABS module replacement: $400–1,200
Related DTCs
- C0057
- C0058
- C0059
- C0060
- C0062
Frequently Asked Questions
Can I drive with C0061?
Yes. The vehicle can usually be driven safely under normal conditions, but the ABS, Traction Control, and Stability Control systems may not function correctly until the fault is repaired.
What is the most common cause of C0061?
The most common causes are a faulty left rear wheel speed sensor, a damaged tone ring, excessive wheel bearing play, metal contamination on the sensor, or damaged wiring and connectors.
Will clearing the DTC permanently fix C0061?
No. Clearing the code only removes it temporarily. If the underlying performance problem remains, the ABS control module will detect the fault again during the next drive cycle.