PowertrainP1866
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 23
| Brand | Code | Description | System |
|---|---|---|---|
| BAIC Motor | P1866 | Clutch half engage point adaptation not started Brand | Powertrain |
| Mercedes-Benz | P1866 | No description available | Powertrain |
| BMW | P1866 | Short circuit to positive Brand | Powertrain |
| Chery | P1866 | Powertrain Data Bus: Missing Messages Brand | Powertrain |
| Daewoo | P1866 | EDS5 Output Circuit Open Brand | Powertrain |
| DFXK | P1866 | Powertrain Data Bus: Missing Messages Brand | Powertrain |
| EOBD | P1866 | Jakamo ei siirry Brand | Powertrain |
| Geely | P1866 | Powertrain Data Bus: Missing Messages Brand | Powertrain |
| GM | P1866 | Transfer Case Cannot Be Shifted Brand | Powertrain |
| Holden | P1866 | Solenoid Valve Supply Voltage 2 Brand | Powertrain |
| Isuzu | P1866 | No description available | Powertrain |
| Land Rover | P1866 | Transfer Case System Fault Brand | Powertrain |
| Mitsubishi | P1866 | High side driver2 over current Brand | Powertrain |
| Opel | P1866 | Transfer Case Cannot Be Shifted Brand | Powertrain |
| Peugeot | P1866 | No description available | Powertrain |
| Porsche | P1866 | Kein Acknowledge auf dem CAN Brand | Powertrain |
| Proton | P1866 | High side driver2 over current Brand | Powertrain |
| Saab | P1866 | Transfer Case Cannot Be Shifted Brand | Powertrain |
| MG (SAIC) | P1866 | Short-To-Battery Error in Actuator Power Supply for Even Clutch, Shifter 2 and Multiplexer 2 Solenoids Brand | Powertrain |
| Smart | P1866 | No description available | Powertrain |
| Sprinter | P1866 | No description available | Powertrain |
| Toyota | P1866 | Data bus powertrain missing messages Brand | Powertrain |
| Volkswagen | P1866 | Drive train data bus missing messages 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 P1866 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P186600 | Monitoring of Electric Heater of the Particulate sensor when the heater is off Brand | Powertrain |
| Sprinter | P186600 | Monitoring of Electric Heater of the Particulate sensor when the heater is off Brand | Powertrain |
6Related codes
Browse Pxxx codes or P186xx codes.