Powertrain
generic / SAE
P0556
Brake Booster Pressure Sensor Circuit Range or Performance
Same as P0555 with the signal in plausible range yet not matching the engine model - drift, partial blockage of the reference port.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 56
Possible causes
- Sensor element drifted 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