NetworkU1120
SeriousSeverity: Serious - have it checked soon
Lost wheel distance message
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 24
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1120 | No description available | Network |
| BYD | U1120 | Engine Brand | Network |
| Chery | U1120 | Engine Brand | Network |
| Daewoo | U1120 | Loss of serial communications for class 2 devices Brand | Network |
| Daihatsu | U1120 | Lost communication with object recognition camera Brand | Network |
| DFFS | U1120 | Vehicle CAN message 0x30D receiving failure Brand | Network |
| DFFX | U1120 | Engine Brand | Network |
| EOBD | U1120 | No description available | Network |
| Geely | U1120 | Engine Brand | Network |
| GM | U1120 | Loss of serial communications for class 2 devices Brand | Network |
| Great Wall | U1120 | Engine Brand | Network |
| Hafei | U1120 | Engine Brand | Network |
| Isuzu | U1120 | No description available | Network |
| Mahindra | U1120 | No description available | Network |
| Mitsubishi | U1120 | Engine Brand | Network |
| Perodua | U1120 | Lost communication with object recognition camera Brand | Network |
| Peugeot | U1120 | No description available | Network |
| Proton | U1120 | Engine Brand | Network |
| Saab | U1120 | Loss of serial communications for class 2 devices Brand | Network |
| Smart | U1120 | No description available | Network |
| Sprinter | U1120 | Valid except code 852 Brand | Network |
| Subaru | U1120 | No description available | Network |
| Suzuki | U1120 | AV SWITCH SIGNAL Brand | Network |
| Toyota | U1120 | Lost wheel distance message 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 U1120 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | U112002 | CAN communication: MCU_3A3 communication error - timeout Brand | Network |
| Mercedes-Benz | U112004 | The security module of the control unit has detected a communication error. There is an internal fault. Brand | Network |
| Mercedes-Benz | U112041 | The security module of the control unit has detected a communication error. General checksum failure. Brand | Network |
| Mercedes-Benz | U112081 | Time sync message invalid (IT-Security) Brand | Network |
| Mercedes-Benz | U112083 | SecOC calculation incorrect (IT-Security) Brand | Network |
| Mercedes-Benz | U112087 | The security module of the control unit has detected a communication error. Brand | Network |
| Mercedes-Benz | U112088 | Time sync message missing. Brand | Network |
| Mercedes-Benz | U1120E0 | Ethernet Inter Processor Communication Containers are dropped on uC Brand | Network |
| Mercedes-Benz | U1120E1 | Ethernet Inter Processor Communication Containers are dropped on uP Brand | Network |
| Mercedes-Benz | U1120E8 | uP is not booting correctly. Brand | Network |
| Mercedes-Benz | U1120E9 | uP Software unexepcted software behaviour. Brand | Network |
| Mercedes-Benz | U1120EB | The security module of the control unit has detected a communication error. Software lockstep security error dectected on master Brand | Network |
| Mercedes-Benz | U1120FA | Communication with control unit FAA has a malfunction Brand | Network |
| Mercedes-Benz | U1120FB | Implausible object data were received from FAA status Brand | Network |
| Mercedes-Benz | U1120FC | Communication with control unit HWA has a malfunction. Brand | Network |
6Related codes
Browse Uxxx codes or U112xx codes.