PowertrainP1786
CautionSeverity: Caution - get it checked when you can
Mode switch input malfunction
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 22
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | P1786 | TCC stuck OFF Brand | Powertrain |
| Chery | P1786 | TCC stuck OFF Brand | Powertrain |
| Daewoo | P1786 | 3-2 Downshift Error Brand | Powertrain |
| Daihatsu | P1786 | Pulley position sensor signal abnormal Brand | Powertrain |
| DFFX | P1786 | TCC stuck OFF Brand | Powertrain |
| DFXK | P1786 | Back-Up Lamp Signal: Open Circuit Brand | Powertrain |
| EOBD | P1786 | 3-2 nedgirsfeil Brand | Powertrain |
| Geely | P1786 | TCC stuck OFF Brand | Powertrain |
| GM | P1786 | 3-2 Downshift Error Brand | Powertrain |
| Great Wall | P1786 | TCC stuck OFF Brand | Powertrain |
| Hafei | P1786 | TCC stuck OFF Brand | Powertrain |
| Honda | P1786 | No description available | Powertrain |
| Hyundai | P1786 | No description available | Powertrain |
| Land Rover | P1786 | Mode switch input malfunction Brand | Powertrain |
| Mahindra | P1786 | No description available | Powertrain |
| Mitsubishi | P1786 | DCC solenoid Brand | Powertrain |
| Perodua | P1786 | Pulley position sensor signal abnormal Brand | Powertrain |
| Peugeot | P1786 | No description available | Powertrain |
| Porsche | P1786 | Druckregler F Kurzschluss nach Masse oder Unterbrechung Brand | Powertrain |
| Proton | P1786 | DCC solenoid Brand | Powertrain |
| Saab | P1786 | 3-2 Downshift Error Brand | Powertrain |
| Suzuki | P1786 | MOTOR CIRCUIT OPEN 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 P178xx codes.