Chassis, generic

C0033 Right Front Tone Wheel

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the right front tone wheel (reluctor or encoder ring) read by the right front wheel speed sensor, the mirror of C0030. It is a signal-plausibility code: 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-C0033 on the S80 together with a grinding noise at the wheel hub caused by a hub that has shifted within the steering knuckle. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains available.

Likely causes

Damaged or contaminated tone ring
Loose or displaced hub bearing
Excessive sensor-to-ring air gap

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Grinding noise from wheel hub

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–700
Time0.8–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rf tone wheel

Related codes

C0034C0030C0039

References: static.nhtsa.gov, en.wikipedia.org.