PowertrainP056B
CautionSeverity: Caution - get it checked when you can
Power supply protection and management unit failure
Key terms: 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?
Codes in this range include oil-pressure, brake-switch and charging-system voltage faults. If the oil-pressure warning light is on, stop the engine as soon as it is safe and do not drive until it is diagnosed. If the battery or charging warning light is on, drive straight to a workshop: the car can stall when the battery runs flat. For any other P05 code, have the car diagnosed promptly rather than continuing to drive.
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 22
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P056B | No description available | Powertrain |
| BAIC Motor | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| BYD | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Chery | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Daewoo | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Daihatsu | P056B | DIST SW check not completed Brand | Powertrain |
| DFFS | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| DFFX | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| DFXK | P056B | Cruise DIST button signal stuck Brand | Powertrain |
| EOBD | P056B | Fartpilot, signal 'Reducer afstand' Brand | Powertrain |
| Geely | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| GM | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Great Wall | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Hafei | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Hyundai | P056B | No description available | Powertrain |
| Isuzu | P056B | No description available | Powertrain |
| Land Rover | P056B | Speed control decrease distance signal Brand | Powertrain |
| Perodua | P056B | DIST SW check not completed Brand | Powertrain |
| Peugeot | P056B | No description available | Powertrain |
| Saab | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| MG (SAIC) | P056B | Cruise Control Decrease Distance Signal Brand | Powertrain |
| Toyota | P056B | Power supply protection and management unit 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.
5Related codes
Browse Pxxx codes or P056xx codes.