OBD-II code · Chassis
C0066 Right Rear Wheel Speed Sensor Circuit Intermittent
Intermittent open or short on the right rear wheel speed sensor circuit. Wheel-speed signals feed ABS, ESC, traction control, transmission and odometer — a single dropped signal disables all of these safety functions until repaired.
Is it safe to drive with C0066?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector unseated
- PossibleWire chafe
- Less likelyConnector with intermittent contact under vibration
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
- Wheel Speed Sensor Rr, Sensor Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.