PowertrainP1838
CautionSeverity: Caution - get it checked when you can
Internal mode switch A circuit high voltage
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 |
|---|---|---|---|
| BAIC Motor | P1838 | Clutch half engage point adaptation, half engage point above upper limit Brand | Powertrain |
| BYD | P1838 | TCC solenoid valve open Brand | Powertrain |
| Chery | P1838 | TCC solenoid valve open Brand | Powertrain |
| Daewoo | P1838 | No Shift Motor Movement Detected Brand | Powertrain |
| DFFS | P1838 | Mechanical or hydraulic failure of engine braking function in first sequence mode Brand | Powertrain |
| DFFX | P1838 | TCC solenoid valve open Brand | Powertrain |
| DFXK | P1838 | Pressure Control Valve 6 (N371): Electrical Malfunction Brand | Powertrain |
| EOBD | P1838 | Drukregelklep 6 Brand | Powertrain |
| Geely | P1838 | TCC solenoid valve open Brand | Powertrain |
| GM | P1838 | No Shift Motor Movement Detected Brand | Powertrain |
| Great Wall | P1838 | TCC solenoid valve open Brand | Powertrain |
| Hafei | P1838 | TCC solenoid valve open Brand | Powertrain |
| Holden | P1838 | Output Speed Sensor Circuit High Voltage Brand | Powertrain |
| Isuzu | P1838 | No description available | Powertrain |
| Land Rover | P1838 | Transfer case shift motor circuit failure Brand | Powertrain |
| Mitsubishi | P1838 | TCC solenoid valve open Brand | Powertrain |
| Opel | P1838 | No Shift Motor Movement Detected Brand | Powertrain |
| Peugeot | P1838 | No description available | Powertrain |
| Porsche | P1838 | No description available | Powertrain |
| Proton | P1838 | TCC solenoid valve open Brand | Powertrain |
| Saab | P1838 | No Shift Motor Movement Detected Brand | Powertrain |
| MG (SAIC) | P1838 | IMS circuit A (R1) - power short Brand | Powertrain |
| Subaru | P1838 | No description available | Powertrain |
| Suzuki | P1838 | System Voltage Low (During Idle Stop) Brand | Powertrain |
| Toyota | P1838 | Internal mode switch A circuit high voltage 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 P1838 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P183800 | PoI2 Shut Off CSERS Brand | Powertrain |
| Sprinter | P183800 | PoI2 Shut Off CSERS Brand | Powertrain |
6Related codes
Browse Pxxx codes or P183xx codes.