NetworkU1F03
SeriousSeverity: Serious - have it checked soon
Night vision ECU not receiving low beam ON/OFF signal from combination switch
Key terms: Control module: a small computer that runs one part of the car
1What it means in plain English
Control modules in the car cannot communicate with each other over the vehicle network.
2Common causes
- Wiring or connector fault on the communication bus
- Faulty control module
- Low battery voltage or poor ground
- Water ingress in a connector or module
- Aftermarket device interfering with the bus
3Can I drive?
The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it towed.
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 8
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | U1F03 | Night vision ECU not receiving low beam ON/OFF signal from combination switch Brand | Network |
| Daewoo | U1F03 | No description available | Network |
| DFFS | U1F03 | No communication with the Built-in System Interface Brand | Network |
| GM | U1F03 | No description available | Network |
| Holden | U1F03 | Lost Communication with Body Control Module Brand | Network |
| Opel | U1F03 | No description available | Network |
| Peugeot | U1F03 | This parameter defines the number of resets following an internal malfunction of the external CD player ECU (incrementation). This parameter is reset to zero if the value of the datum is higher than 255 or if faults U1F0A / U1F0F / are recorded Brand | Network |
| Saab | U1F03 | No description available | Network |
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 Uxxx codes or U1F0xx codes.