NetworkU1111
SeriousSeverity: Serious - have it checked soon
Lost communication (IDM)
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 30
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1111 | No description available | Network |
| BYD | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Chery | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Chrysler | U1111 | lost odometer message Brand | Network |
| Daewoo | U1111 | Loss of serial communications for class 2 devices Brand | Network |
| Daihatsu | U1111 | Fr sonar ECU communication error Brand | Network |
| DFFS | U1111 | Ccan_GW33A_AmbTemp message is invalid Brand | Network |
| DFFX | U1111 | Display CAN timeout/Not equipped Brand | Network |
| EOBD | U1111 | Kaotatud side Brand | Network |
| Geely | U1111 | Display CAN timeout/Not equipped Brand | Network |
| GM | U1111 | Loss of serial communications for class 2 devices Brand | Network |
| Great Wall | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Hafei | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Holden | U1111 | Lost Communication with Battery Energy Control Module Brand | Network |
| Hyundai | U1111 | No description available | Network |
| Isuzu | U1111 | No description available | Network |
| Mahindra | U1111 | No description available | Network |
| Mitsubishi | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Nissan | U1111 | No description available | Network |
| Opel | U1111 | Loss of serial communications for class 2 devices Brand | Network |
| Perodua | U1111 | Fr sonar ECU communication error Brand | Network |
| Peugeot | U1111 | No description available | Network |
| Proton | U1111 | Display CAN timeout/Not equipped Brand | Network |
| Saab | U1111 | Loss of serial communications for class 2 devices Brand | Network |
| MG (SAIC) | U1111 | Loss Communication With BMS Brand | Network |
| Smart | U1111 | No description available | Network |
| Sprinter | U1111 | No description available | Network |
| Suzuki | U1111 | No description available | Network |
| Toyota | U1111 | Lost communication (IDM) Brand | Network |
| Volkswagen | U1111 | Function restricted due to missing message(s); Short to ground 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 3
These 7-character codes are manufacturer-specific variants of U1111 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Hyundai | U111100 | If LIN message from battery sensor is not received, ECM sets DTC Brand | Network |
| Volkswagen | U111100 | Functional impairment due to missing message Brand | Network |
| SsangYong | U111102 | CAN communication: EVCC_342 communication error - timeout Brand | Network |
6Related codes
Browse Uxxx codes or U111xx codes.