OBD Codes List

Diagnostic reference · C003A

C003A

Right Rear Wheel Speed Sensor

System
Chassis control (C code)
Lamp
ABS Light
Category
Chassis

What it means

C003A means Right Rear Wheel Speed Sensor.

Where it lives

For C003A, the description names the sensor as the part involved.

Check these first

  • A failed right rear wheel speed sensor
  • Open or short in the right rear wheel speed sensor wiring
  • A corroded connector at the right rear wheel speed sensor
  • A worn right rear wheel bearing or hub

What to do next

  1. Read the ABS codes and note the right rear sensor fault
  2. Inspect the right rear wheel speed sensor connector for corrosion
  3. Test the right rear sensor circuit for opens and shorts
  4. Compare right rear wheel speed to the other wheels in live data
  5. Replace the right rear wheel speed sensor if the signal drops out
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.