OBD-II code · Chassis
C0235 Wheel Speed Sensor Signal Erratic
The ABS control module has detected an erratic wheel speed sensor signal — sudden jumps or dropouts compared to the other wheels. Typical causes are a damaged tone ring or a loose sensor.
Is it safe to drive with C0235?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTone ring damaged or contaminated with metal debris
- PossibleWheel speed sensor loose in housing
- Less likelyExcessive hub bearing play
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
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Wheel Speed Sensor, Tone Ring, ABS Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.