PowertrainP0556
SeriousSeverity: Serious - have it checked soon
Brake Booster Pressure Sensor Circuit Range/Performance
Key terms: Boost pressure: extra air pressure made by a turbo or supercharger · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
This range covers vehicle speed, idle and oil-pressure control, charging-system voltage, and brake-switch circuits.
2Common causes
- Carbon build-up in the throttle body
- Faulty idle air control valve
- Faulty vehicle speed sensor
- Faulty charging system or weak battery
- Wiring or connector fault
3Can I drive?
Have it checked immediately: brakes or brake assistance may be affected. Do not drive if the pedal feels soft or hard, the car pulls when braking, or the brake warning light is on.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 32
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0556 | Rocker Arm Actuator. Actuator 1. Stuck Off. Bank 1 Brand | Powertrain |
| BAIC Motor | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| BYD | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Chery | P0556 | Vacuum sensor signal implausible Brand | Powertrain |
| Daewoo | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Daihatsu | P0556 | Brake pressure sensor system Brand | Powertrain |
| DFFS | P0556 | Brake circuit vacuum sensor failure Brand | Powertrain |
| DFFX | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| DFXK | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| EOBD | P0556 | Bromsservotryckgivarkrets område/prestanda Brand | Powertrain |
| Geely | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| GM | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Great Wall | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Hafei | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Holden | P0556 | Brake Booster Vacuum Sensor Circuit Brand | Powertrain |
| Honda | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Hyundai | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Isuzu | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Land Rover | P0556 | Brake booster pressure sensor - circuit range/performance Brand | Powertrain |
| Maserati | P0556 | Brake Booster Pressure Sensor Circuit Performance Brand | Powertrain |
| Mitsubishi | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Nissan | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Opel | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Perodua | P0556 | Brake pressure sensor system Brand | Powertrain |
| Peugeot | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Porsche | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Proton | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Saab | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| MG (SAIC) | P0556 | BKV Pressure non-plausible Brand | Powertrain |
| Subaru | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance SAE | Powertrain |
| Tata | P0556 | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Toyota | P0556 | Brake boost pressure sensor performance failure Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 3
These 7-character codes are manufacturer-specific variants of P0556 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P055600 | Brake booster pressure sensor circuit range/performance Brand | Powertrain |
| Mercedes-Benz | P0556FC | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
| Mercedes-Benz | P0556FE | Brake Booster Pressure Sensor Circuit Range/Performance Brand | Powertrain |
6Related codes
Browse Pxxx codes or P055xx codes.