Powertrain
generic / SAE
P0555
Brake Booster Pressure Sensor Circuit
A general circuit fault is detected on the brake booster pressure sensor - the ECU cannot determine vacuum reserve in the booster, which limits the safe operation of stop-start, regenerative-braking blending, and electric vacuum pump control.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 55
Possible causes
- Open in sensor or wiring high
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 80–320 €
- Estimated time: 0.4–1.4 h
- Component: brake booster pressure sensor
- MIL / check engine light
Sources
References
sae:J2012