PowertrainP1257
CautionSeverity: Caution - get it checked when you can
Supercharge Engine Over Boost
Key terms: Supercharger: an engine-driven fan that pushes extra air into the engine · Boost pressure: extra air pressure made by a turbo or supercharger · Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
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 21
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1257 | Engine Intercooler Temperature. Inlet Air Temperature. - The Temperature Difference Is Too Big. Bank 1 Brand | Powertrain |
| BAIC Motor | P1257 | oil inlet control valve oil pressure control failed Brand | Powertrain |
| BYD | P1257 | NO. 600 battery voltage sampling wire loop fault Brand | Powertrain |
| Chery | P1257 | Engine Coolant System Valve-N214 Open Brand | Powertrain |
| Daewoo | P1257 | Supercharger System Overboost Brand | Powertrain |
| DFXK | P1257 | Coolant Circulation Valve (N214): Open Circuit Brand | Powertrain |
| EOBD | P1257 | Lpg-systeem Brand | Powertrain |
| Ford | P1257 | No description available | Powertrain |
| Geely | P1257 | Engine Coolant System Valve-N214 Open Brand | Powertrain |
| GM | P1257 | Supercharge Engine Over Boost Brand | Powertrain |
| Great Wall | P1257 | Engine Coolant System Valve-N214 Open Brand | Powertrain |
| Isuzu | P1257 | No description available | Powertrain |
| Land Rover | P1257 | Pedal Correlation PDS2 And HPDS Brand | Powertrain |
| Mahindra | P1257 | No description available | Powertrain |
| Mazda | P1257 | No description available | Powertrain |
| Mitsubishi | P1257 | No description available | Powertrain |
| Peugeot | P1257 | No description available | Powertrain |
| Porsche | P1257 | No description available | Powertrain |
| Proton | P1257 | Engine Coolant System Valve-N214 Open Brand | Powertrain |
| Saab | P1257 | Gönnen Motor Over-Boost Brand | Powertrain |
| Tata | P1257 | Rail Pressure Control - Trim Low And Flow High 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 1
These 7-character codes are manufacturer-specific variants of P1257 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P125700 | Pressure regulation: min trim (rail pressure gouvernor) in high fuel condition Brand | Powertrain |
6Related codes
Browse Pxxx codes or P125xx codes.