OBD-II code · Chassis
C0238 Speed Wheel-to-Wheel Mismatch
The ABS control module has detected an implausible speed difference between wheels that cannot be explained by cornering. This typically points to one suspect sensor, mismatched tyre sizes or a damaged tone ring.
Is it safe to drive with C0238?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTyre sizes or wear levels do not match across axles
- PossibleTone ring missing teeth on one wheel
- Less likelyWheel speed sensor degraded
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, Tires, ABS Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.