Code Definition

C003A (29-C8) — Right Rear Wheel Speed Sensor

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

About C003A

C003A 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.

When C003A is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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 C003A 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

The Antilock Brake System (ABS) control module monitors the right rear wheel speed sensor circuit for a valid and rational speed signal compared with the other wheel speed inputs. DTC C003A is set when the module detects an implausible or erratic signal from the right rear wheel speed sensor, indicating a performance fault rather than a complete electrical failure. This condition is typically logged when the signal frequency or amplitude does not correlate with vehicle speed or deviates excessively from the remaining wheel speed sensors during operation. The driver may notice ABS, traction con...

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