Left Front Wheel Speed Sensor Signal Erratic
The control module sees erratic pulses from the left front wheel speed sensor at speed. Common cause is metallic debris on a magnetic encoder or a damaged tone ring.
Affected components
- Wheel speed sensor fl
- Tone ring
- Hub bearing
Common causes
- High likelihood: Magnetic encoder ring contaminated
- Medium likelihood: Tone ring cracked or missing teeth
- Low likelihood: Connector with intermittent contact under vibration
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.