NetworkU1040
SeriousSeverity: Serious - have it checked soon
Loss of Class 2 Communications with ABS
Key terms: ABS: anti-lock braking, which stops the wheels locking · 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 15
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U1040 | No description available | Network |
| Chery | U1040 | Gateway lost communication with CAN 4 network segment T-BOX Brand | Network |
| Daewoo | U1040 | Loss of Class 2 Communications with ABS Brand | Network |
| EOBD | U1040 | Mootori sideahel Brand | Network |
| GM | U1040 | Loss of Class 2 Communications with ABS Brand | Network |
| Holden | U1040 | Lost Communication with Electronic Brake Control Module Brand | Network |
| Isuzu | U1040 | No description available | Network |
| Land Rover | U1040 | No description available | Network |
| Mitsubishi | U1040 | No description available | Network |
| Opel | U1040 | Loss of Class 2 Communications with ABS Brand | Network |
| Peugeot | U1040 | No description available | Network |
| Saab | U1040 | Loss of Class 2 Communications with ABS Brand | Network |
| Smart | U1040 | No description available | Network |
| Sprinter | U1040 | No description available | Network |
| Suzuki | U1040 | ENG COMM CIRCUIT 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 8
These 7-character codes are manufacturer-specific variants of U1040 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U104088 | High Speed HU-CAN Communication Bus Performance.BusOff. Brand | Network |
| Mercedes-Benz | U1040E1 | Das FlexRay-Signal BSM_Md_Rq_HU vom TGW-SG ist fehlerhaft. Brand | Network |
| Mercedes-Benz | U1040E2 | Das FlexRay-Signal DTQ_Md_Rq_HU vom TGW-SG zeigt einen Fehler an. Brand | Network |
| Mercedes-Benz | U1040E3 | Das FlexRay-Signal DTQ_Md_Rq_HU vom TGW-SG ist fehlerhaft. Brand | Network |
| Mercedes-Benz | U1040E4 | Das FlexRay-Signal LDC_CMS_Md_Rq_HU vom TGW-SG zeigt einen Fehler an. Brand | Network |
| Mercedes-Benz | U1040E5 | Das FlexRay-Signal LDC_CMS_Md_Rq_HU vom TGW-SG ist fehlerhaft. Brand | Network |
| Mercedes-Benz | U1040E6 | Das FlexRay-Signal LDP_MPC_Md_Rq_HU vom TGW-SG zeigt einen Fehler an. Brand | Network |
| Mercedes-Benz | U1040E7 | Das FlexRay-Signal LDP_MPC_Md_Rq_HU vom TGW-SG ist fehlerhaft. Brand | Network |
6Related codes
Browse Uxxx codes or U104xx codes.