OBD-II code · Chassis
C0666 Right Rear Wheel Speed Sensor B Circuit/Open
Right Rear Wheel Speed Sensor B Circuit/Open: the circuit is open. Wheel-speed signals feed ABS, ESC, traction control and the speedometer.
Is it safe to drive with C0666?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor wiring broken
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Rr Wss B
Related codes
- C0512Right Rear Wheel Speed Sensor A Circuit/Open
- C0663Left Rear Wheel Speed Sensor B Intermittent/Erratic
- C0664Left Rear Wheel Speed Sensor B Correlation
- C0665Left Rear Wheel Speed Sensor B Incorrect Component Installed
- C0667Right Rear Wheel Speed Sensor B Range/Performance
- C0668Right Rear Wheel Speed Sensor B Circuit Low
- C0669Right Rear Wheel Speed Sensor B Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.