OBD-II DTC · SAE J2012
P0556
Brake Booster Pressure Sensor Circuit Range/Performance
What P0556 means
P0556 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Brake Booster Pressure Sensor Circuit Range/Performance. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.
Can this code be suppressed via ECU tuning?
Generally NOT recommended to suppress without fixing the underlying issue. Boost-related DTCs often indicate genuine turbo or wastegate problems that warrant inspection.