Code
C0300
Brakes / ABS
Rear wheel speed signal error
The ABS sees an implausible difference between the rear wheels.
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Most likely causes
- Mismatched tires left vs right
- Faulty rear sensor
- Damaged tone ring
Symptoms you may notice
- ABS/ESP light
- Traction control disabled
Checks to run
- Check tire sizes and pressures
- Compare rear wheel speeds live
- Test sensors
Tools you may need
OBD-II scanner
Tire gauge
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.