PowertrainP1904
CautionSeverity: Caution - get it checked when you can
Input system 1 failure for DC-DC converter
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 21
| Brand | Code | Description | System |
|---|---|---|---|
| BAIC Motor | P1904 | On-board charger overvoltage protection fault Brand | Powertrain |
| Mercedes-Benz | P1904 | No description available | Powertrain |
| Chery | P1904 | Motor cable circuit short Brand | Powertrain |
| Daewoo | P1904 | Kickdown Solenoid Circ High Voltage Brand | Powertrain |
| DFFS | P1904 | Shift sensor output is too high Brand | Powertrain |
| DFXK | P1904 | Master negative contactor fault Brand | Powertrain |
| EOBD | P1904 | Sporvalgposisjon B Brand | Powertrain |
| Ford | P1904 | Input system 1 failure for DC-DC converter Brand | Powertrain |
| Geely | P1904 | Cooling Fan Valve (N313): Open or Short to Ground Brand | Powertrain |
| GM | P1904 | Kickdown Solenoid Circ High Voltage Brand | Powertrain |
| Holden | P1904 | Drive Motor 1 Position Sensor Sense Circuit 1 High Voltage Brand | Powertrain |
| Isuzu | P1904 | No description available | Powertrain |
| Land Rover | P1904 | Kickdown solenoid - circuit high voltage Brand | Powertrain |
| Mahindra | P1904 | No description available | Powertrain |
| Mazda | P1904 | Input system 1 failure for DC-DC converter Brand | Powertrain |
| Opel | P1904 | Kickdown Solenoid Circ High Voltage Brand | Powertrain |
| Peugeot | P1904 | No description available | Powertrain |
| Saab | P1904 | Kickdown Solenoid Circ High Voltage Brand | Powertrain |
| Smart | P1904 | No description available | Powertrain |
| Suzuki | P1904 | Clutch Closing During Engage Brand | Powertrain |
| Tata | P1904 | No description available | 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 1
These 7-character codes are manufacturer-specific variants of P1904 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P190400 | Variant coding: Smart Key Module (SKM) setting error Brand | Powertrain |
6Related codes
Browse Pxxx codes or P190xx codes.