A rear wheel speed sensor is not operating correctly.
Informational only. Consult a qualified mechanic.
Replace the rear wheel speed sensor.
The C0300 OBD-II diagnostic trouble code (DTC) indicates: rear speed sensor malfunction. This is a medium-severity chassis code that your vehicle's onboard diagnostics system triggers when a rear wheel speed sensor is not operating correctly. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
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