C0666
Right Rear Wheel Speed Sensor B Circuit/Open
C0666 is an OBD-II diagnostic trouble code meaning: Right Rear Wheel Speed Sensor B Circuit/Open. Common causes: broken or damaged wiring harness to the sensor, poor contact in the sensor connector. Estimated repair cost: $33–111.
Symptoms
- The ABS, ESP or stabilization system warning light is on
- Disabling the ABS or ESP system
- Incorrect operation of cruise control
- Errors in related systems
Causes
- Broken or damaged wiring harness to the sensor
- Poor contact in the sensor connector
- Malfunction of the wheel speed sensor itself
- Damage to the gear rotor (comb) on the hub
- Problems with the ABS ECU
How to Fix
- Check the integrity of the wiring harness to the sensor
- Inspect connectors for oxidation or damage
- Check sensor resistance (must meet specification)
- Clean the sensor and gear rotor from dirt
- Replacing a faulty speed sensor
- Check the operation of the system after repair
Related codes
Error C0666 by Vehicle Brand
FAQ
What does the C0666 code mean?
C0666 is an OBD-II diagnostic trouble code that indicates: Right Rear Wheel Speed Sensor B Circuit/Open
What causes a C0666 error code?
The most common causes of C0666 include: Broken or damaged wiring harness to the sensor; Poor contact in the sensor connector; Malfunction of the wheel speed sensor itself; Damage to the gear rotor (comb) on the hub.
How do I fix a C0666 diagnostic trouble code?
To fix C0666: Check the integrity of the wiring harness to the sensor. Inspect connectors for oxidation or damage. Check sensor resistance (must meet specification). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0666?
Limited driving only, diagnose soon
How much does it cost to fix C0666?
The estimated repair cost for C0666 is $33–111. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat