Code Definition

C0231 — Rear Wheel Speed Signal Erratic

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About C0231

C0231 is a generic (obd-ii standard) chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C0231 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

C0231 is a chassis code stored by the ABS or electronic brake control module when the rear wheel speed signal it receives is erratic, meaning the signal is present but unstable, intermittent or implausible when compared against the other wheels. Wheel speed sensors on modern vehicles are active hall effect units that take a supply from the ABS module and return a square wave current signal whose frequency rises with wheel speed, read off a magnetic encoder ring moulded into the wheel bearing seal or a toothed tone ring on the hub or driveshaft. The module compares all four wheel speeds continu...

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