C0030Left Front Tone Wheel
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers the left front tone wheel (reluctor or encoder ring) that the wheel speed sensor reads to measure rotation. This is a signal-plausibility code rather than a sensor circuit fault: the module sees an erratic, noisy or intermittent speed signal consistent with a damaged, contaminated or loose tone ring rather than a sensor electrical failure. Volvo documents BCM-C0030 on the S80 together with a grinding noise at the wheel hub when the hub has shifted within the steering knuckle. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains.
- What you may notice
- ABS warning lamp on
- ABS and stability control disabled
- Grinding noise from wheel hub
- Likely causes
- LikelyDamaged or contaminated tone ring
- PossibleLoose or displaced hub bearing
- RareExcessive sensor-to-ring air gap
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.