NetworkU1122

Serious

Severity: Serious - have it checked soon

Data bus implausible message

26 brands affected · Description from Toyota data.

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?

Serious · drive with care

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 26

Brand	Code	Description	System
Mercedes-Benz	U1122	No description available	Network
BYD	U1122	ASC/ESP/TCL/ABS Brand	Network
Chery	U1122	ASC/ESP/TCL/ABS Brand	Network
Daewoo	U1122	Loss of serial communications for class 2 devices Brand	Network
DFFS	U1122	Vehicle CAN message 0x349 receiving failure Brand	Network
DFFX	U1122	ASC/ESP/TCL/ABS Brand	Network
EOBD	U1122	ASC/TCL/ABS Brand	Network
Geely	U1122	ASC/ESP/TCL/ABS Brand	Network
GM	U1122	Loss of serial communications for class 2 devices Brand	Network
Great Wall	U1122	ASC/ESP/TCL/ABS Brand	Network
Hafei	U1122	ASC/ESP/TCL/ABS Brand	Network
Holden	U1122	Lost Communication with Cruise Control Module Brand	Network
Isuzu	U1122	No description available	Network
Mitsubishi	U1122	ASC/TCL/ABS Brand	Network
Opel	U1122	Loss of serial communications for class 2 devices Brand	Network
Peugeot	U1122	No description available	Network
Porsche	U1122	No description available	Network
Proton	U1122	ASC/TCL/ABS Brand	Network
Saab	U1122	Loss of serial communications for class 2 devices Brand	Network
Maxus (SAIC)	U1122	DTC configuration for: lost communication with BCM Brand	Network
MG (SAIC)	U1122	DTC configuration for: lost communication with BCM Brand	Network
Smart	U1122	No description available	Network
Sprinter	U1122	No description available	Network
Subaru	U1122	No description available	Network
Toyota	U1122	Data bus implausible message Brand	Network
Volkswagen	U1122	Databus: implausible message; Defective 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 4

These 7-character codes are manufacturer-specific variants of U1122 and may be reported by some scan tools.

Brand	Code	Description	System
Porsche	U112200	No active fault codes stored except: “C110B54 Calibration“ and “ Data bus – message implausible“ Brand	Network
SsangYong	U112202	CAN communication: SBW_1E7 communication error - timeout Brand	Network
Mercedes-Benz	U112256	Communication with one or more color generation and coupling modules on LIN bus 1 has a malfunction. An incorrect or incompatible configuration was detected. Brand	Network
Mercedes-Benz	U112295	Communication with one or more color generation and coupling modules on LIN bus 1 has a malfunction. The mechanical setup is not OK. Brand	Network

6Related codes

Browse Uxxx codes or U112xx codes.