OBD-II code · Chassis
C0234 Wheel Speed Sensor Frequency Error
The ABS control module has detected that one of the wheel speed sensor signals has a frequency outside the plausible range, e.g. unrealistically high pulses or signal dropouts at speed. Stability control may be limited.
Is it safe to drive with C0234?
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, missing teeth, or contaminated
- PossibleSensor air gap incorrect (loose mounting)
- 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
- 0.5–2.5 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.