Wheel Speed Sensor Frequency Mismatch
The ABS control module has detected that the frequency of one wheel speed sensor signal does not match the others under stable driving conditions. This often indicates a tone ring with extra or missing teeth or a sensor with degraded signal quality.
Affected components
- Wheel speed sensor
- Tone ring
- Abs control module
Common causes
- High likelihood: Tone ring damaged or contaminated
- Medium likelihood: Wheel speed sensor degraded
- Low likelihood: Tyre size mismatch
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.