C0237
Loss of Speed Sensor Signal Front Left
The ABS control module has lost the wheel speed signal from the front left wheel during driving. ABS and stability control are disabled because wheel-individual speed information is required for slip detection.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Wheel speed sensor failedCommon
- Wiring break at wheel archPossible
- Tone ring damagedLess likely
Parts involved
- Wheel Speed Sensor
- Tone Ring
- ABS Control Module
- Sensor Wiring
C0237 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.