What it means
Right Rear Wheel Speed Sensor B Incorrect Component Installed: the installed component does not match the type the vehicle expects. Wheel-speed signals feed ABS, ESC, traction control and the speedometer.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The right rear Wheel Speed Sensor B provides wheel-speed information to the brake control module. C066C indicates that the installed component is not the type the system expects, so its electrical behavior or signal may not match the vehicle's calibration.
Common causes
Most likely first.
- Incorrect replacement wheel speed sensor
- Wrong sensor type or electrical specification
- Sensor not fully seated or installed in the correct position
- Connector or wiring mismatch
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Check freeze-frame and live wheel-speed data to see whether right rear Sensor B is missing, implausible, or different from the other wheels.
- Inspect the Sensor B connector and harness for damage, pin mismatch, or an adapter or splice that may indicate an incompatible replacement.
- Verify the installed right rear Sensor B part and sensor type against the vehicle's application information and manufacturer's specification.
- Check that Sensor B is fully seated in the correct position and that its connector matches the vehicle harness.
- If the component and fit appear correct, test the Sensor B circuit and signal against the manufacturer's specification to distinguish a wrong component from wiring trouble.
Common fixes
- Install the correct right rear Wheel Speed Sensor B for the vehicle.
- Seat the sensor correctly and secure its connector.
- Repair any connector or wiring mismatch using the manufacturer's wiring information.
- Replace a sensor that does not meet the specified electrical or signal requirements.
Can I keep driving?
ABS and stability control may not operate normally while the wrong Sensor B is installed. Drive cautiously only if braking feels normal, and avoid conditions where ABS or stability control may be needed until it is corrected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.