PowertrainP1812
CautionSeverity: Caution - get it checked when you can
Short circuit to positive
Key terms: 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 25
| Brand | Code | Description | System |
|---|---|---|---|
| BMW | P1812 | Short circuit to positive Brand | Powertrain |
| Chery | P1812 | Brake pedal angle signal out of reasonable range Brand | Powertrain |
| Daewoo | P1812 | 4WD Mode Select Switch Circ Open Brand | Powertrain |
| Daihatsu | P1812 | Electromagnetic clutch system disconnect Brand | Powertrain |
| DFFS | P1812 | Reversing light circuit failure Brand | Powertrain |
| DFXK | P1812 | Motor controller IGBT overcurrent fault: level 2 Brand | Powertrain |
| EOBD | P1812 | Backljuskrets Brand | Powertrain |
| Ford | P1812 | No description available | Powertrain |
| GM | P1812 | 4WD Mode Select Switch Circ Open Brand | Powertrain |
| Holden | P1812 | Pressure Control Solenoid Valve 1 Control Circuit Brand | Powertrain |
| Honda | P1812 | No description available | Powertrain |
| Land Rover | P1812 | 4-Wheel Drive Mode Select Circuit Failure Brand | Powertrain |
| Mahindra | P1812 | No description available | Powertrain |
| Mazda | P1812 | No description available | Powertrain |
| Mitsubishi | P1812 | Brake signal error Brand | Powertrain |
| Opel | P1812 | 4WD Mode Select Switch Circ Open Brand | Powertrain |
| Perodua | P1812 | Electromagnetic clutch system disconnect Brand | Powertrain |
| Peugeot | P1812 | No description available | Powertrain |
| Proton | P1812 | Brake signal error Brand | Powertrain |
| Saab | P1812 | 4WD Mode Select Switch Circ Open Brand | Powertrain |
| MG (SAIC) | P1812 | Solenoid- or Solenoid+ Open Circuit Brand | Powertrain |
| Smart | P1812 | No description available | Powertrain |
| Suzuki | P1812 | Shift Control System Malfunction Brand | Powertrain |
| Tata | P1812 | No description available | Powertrain |
| Toyota | P1812 | Backup lamp circuit 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 2
These 7-character codes are manufacturer-specific variants of P1812 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P181200 | CRC-Fehler CAN-Botschaft ECU_Req4_TCM Brand | Powertrain |
| SsangYong | P181200 | CAN: ECU message not received Brand | Powertrain |
6Related codes
Browse Pxxx codes or P181xx codes.