C0556: Right Front Wheel Speed Sensor A Incorrect Component Installed
Standardized SAE J2012 code · C05xx codes
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does C0556 mean?
The brake booster vacuum or pressure sensor signal does not respond plausibly to engine vacuum or electric booster activity.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
- High Vacuum leak in booster line
- Medium Vacuum pump weak
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of C0556 on the same make and model first.
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