PowertrainP1799
CautionSeverity: Caution - get it checked when you can
Multifunction switch (CMF) signal failure
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 23
| Brand | Code | Description | System |
|---|---|---|---|
| BAIC Motor | P1799 | Vehicle drive chip initialization fault Brand | Powertrain |
| Mercedes-Benz | P1799 | No description available | Powertrain |
| Chery | P1799 | Transmission Output Speed Sensor 2 (G196): RPM too High Brand | Powertrain |
| Daewoo | P1799 | Hold Switch Circuit Brand | Powertrain |
| DFFS | P1799 | Multifunction switch (CMF) signal failure Brand | Powertrain |
| DFXK | P1799 | Transmission Output Speed Sensor 2 (G196): RPM too High Brand | Powertrain |
| EOBD | P1799 | Idirghlas Brand | Powertrain |
| Geely | P1799 | Transmission Output Speed Sensor 2 (G196): RPM too High Brand | Powertrain |
| GM | P1799 | Hold Switch Circuit Brand | Powertrain |
| Holden | P1799 | Auxiliary Transmission Fluid Pump Pressure Switch Circuit High Voltage Brand | Powertrain |
| Honda | P1799 | No description available | Powertrain |
| Land Rover | P1799 | CAN transmission control module - ABS circuit malfunction Brand | Powertrain |
| Maserati | P1799 | No description available | Powertrain |
| Mitsubishi | P1799 | Brake pressure SNS. information Brand | Powertrain |
| Nissan | P1799 | No description available | Powertrain |
| Opel | P1799 | Hold Switch Circuit Brand | Powertrain |
| Peugeot | P1799 | No description available | Powertrain |
| Porsche | P1799 | Magnetventil A Kurzschluss nach Plus oder Unterbrechung Brand | Powertrain |
| Proton | P1799 | Brake pressure SNS. information Brand | Powertrain |
| Saab | P1799 | Hold Switch Circuit Brand | Powertrain |
| Smart | P1799 | No description available | Powertrain |
| Subaru | P1799 | Interlock Brand | Powertrain |
| Toyota | P1799 | Multifunction switch (CMF) signal 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 P179xx codes.