NetworkU103F
SeriousSeverity: Serious - have it checked soon
Left Headlamp Leveling Module LIN Communication Failure
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 2
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U103F | No description available | Network |
| Maserati | U103F | Left Headlamp Leveling Module LIN Communication Failure Brand | 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.
5Extended variant codes 15
These 7-character codes are manufacturer-specific variants of U103F and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U103F00 | Ethernet communication has a malfunction. DEM_BOSCH_EthernetComm_MALFUNCTION Brand | Network |
| Mercedes-Benz | U103F01 | Ethernet communication has a malfunction. Debug data for DEM_BOSCH_EthernetComm_MALFUNCTION Brand | Network |
| Mercedes-Benz | U103F13 | Ethernet communication has a malfunction. There is an open circuit. Brand | Network |
| Mercedes-Benz | U103F2B | Ethernet communication has a malfunction. The electrical lines have a short circuit to each other. Brand | Network |
| Mercedes-Benz | U103F56 | Ethernet communication has a malfunction. ETH switch configuration error Brand | Network |
| Mercedes-Benz | U103F85 | Ethernet communication has a malfunction. There is a signal above the permissible limit value. Brand | Network |
| Mercedes-Benz | U103F88 | Ethernet communication has a malfunction. Bus OFF Brand | Network |
| Mercedes-Benz | U103F95 | Ethernet communication has a malfunction. The mechanical setup is not OK. Brand | Network |
| Mercedes-Benz | U103F96 | Ethernet communication has a malfunction. Component Internal Failure Brand | Network |
| Mercedes-Benz | U103F9A | Ethernet communication has a malfunction. Component or System Operating Conditions Brand | Network |
| Mercedes-Benz | U103FE0 | Ethernet communication has a malfunction. DEM_BOSCH_ETH_LEO_P5_LINK_ERR Brand | Network |
| Mercedes-Benz | U103FE1 | Ethernet communication has a malfunction. DEM_BOSCH_ETH_LEO_P3_LINK_ERR Brand | Network |
| Mercedes-Benz | U103FE2 | Ethernet communication has a malfunction. DEM_BOSCH_ETH_LEO_P2_LINK_ERR Brand | Network |
| Mercedes-Benz | U103FE6 | uC Ethernet Controller failed to respond Configuration Command Brand | Network |
| Mercedes-Benz | U103FE7 | Errors related to TcpIp-Wrapper 2 Bytes - App Id 2 Bytes - Error Code Brand | Network |
6Related codes
Browse Uxxx codes or U103xx codes.