PowertrainP1638
CautionSeverity: Caution - get it checked when you can
Throttle briefly jammed
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 28
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1638 | No description available | Powertrain |
| BAIC Motor | P1638 | 5V supply circuit 2 too low Brand | Powertrain |
| Mercedes-Benz | P1638 | No description available | Powertrain |
| BMW | P1638 | Throttle briefly jammed Brand | Powertrain |
| BYD | P1638 | Actuator valve 4 circuit fault Brand | Powertrain |
| Chery | P1638 | VDD5 undervoltage Brand | Powertrain |
| Daewoo | P1638 | Generator F-Terminal Circuit Brand | Powertrain |
| Daihatsu | P1638 | ETC CPU abnormal Brand | Powertrain |
| DFXK | P1638 | Powertrain Data Bus: Missing Message from Clutch Controller Brand | Powertrain |
| EOBD | P1638 | Jordkrets Brand | Powertrain |
| Geely | P1638 | Powertrain Data Bus: Missing Message from Clutch Controller Brand | Powertrain |
| GM | P1638 | Circuit borne F générateur Brand | Powertrain |
| Great Wall | P1638 | Monitoring unit undervoltage Brand | Powertrain |
| Honda | P1638 | No description available | Powertrain |
| Hyundai | P1638 | No description available | Powertrain |
| Isuzu | P1638 | No description available | Powertrain |
| Land Rover | P1638 | No description available | Powertrain |
| Mahindra | P1638 | No description available | Powertrain |
| Mitsubishi | P1638 | ETV command Brand | Powertrain |
| Perodua | P1638 | ETC CPU abnormal Brand | Powertrain |
| Peugeot | P1638 | No description available | Powertrain |
| Porsche | P1638 | No description available | Powertrain |
| Proton | P1638 | ETV command Brand | Powertrain |
| Saab | P1638 | Circuit borne F générateur Brand | Powertrain |
| Sprinter | P1638 | No description available | Powertrain |
| Suzuki | P1638 | Immobilizer information mismatched Brand | Powertrain |
| Tata | P1638 | No description available | Powertrain |
| Toyota | P1638 | Data bus powertrain missing message from clutch control 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 3
These 7-character codes are manufacturer-specific variants of P1638 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P163800 | Over temperature error for AltLmp Brand | Powertrain |
| Sprinter | P163800 | Over temperature error for AltLmp Brand | Powertrain |
| SsangYong | P163800 | TCU internal fault (RAM CAN controller 1) Brand | Powertrain |
6Related codes
Browse Pxxx codes or P163xx codes.