NetworkU1100

Serious

Severity: Serious - have it checked soon

Engine CAN timeout

31 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 31

Brand	Code	Description	System
BAIC Motor	U1100	Voltage too high Brand	Network
Mercedes-Benz	U1100	No description available	Network
BYD	U1100	Engine CAN timeout Brand	Network
Chery	U1100	Engine CAN timeout Brand	Network
Daewoo	U1100	Loss of serial communications for class 2 devices Brand	Network
Daihatsu	U1100	METER transmission abnormal Brand	Network
DFFX	U1100	Engine CAN timeout Brand	Network
DFXK	U1100	Communication lost between ECU and VLC control module Brand	Network
EOBD	U1100	Komponentskydd Brand	Network
Geely	U1100	Engine CAN timeout Brand	Network
GM	U1100	Loss of serial communications for class 2 devices Brand	Network
Great Wall	U1100	Engine CAN timeout Brand	Network
Hafei	U1100	Engine CAN timeout Brand	Network
Holden	U1100	Lost Communication with Vehicle Performance Data Recorder Brand	Network
Honda	U1100	No description available	Network
Hyundai	U1100	No description available	Network
Isuzu	U1100	No description available	Network
Land Rover	U1100	No description available	Network
Mitsubishi	U1100	Engine CAN timeout Brand	Network
Opel	U1100	Loss of serial communications for class 2 devices Brand	Network
Perodua	U1100	METER transmission abnormal Brand	Network
Peugeot	U1100	No description available	Network
Proton	U1100	Engine CAN timeout Brand	Network
Saab	U1100	Loss of serial communications for class 2 devices Brand	Network
MG (SAIC)	U1100	CAN configuration not present Brand	Network
Smart	U1100	No description available	Network
Sprinter	U1100	No description available	Network
Subaru	U1100	No description available	Network
Suzuki	U1100	Lost Communication With ESP 2 Brand	Network
Tata	U1100	CAN Communication Brand	Network
Toyota	U1100	Engine CAN timeout 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 1

These 7-character codes are manufacturer-specific variants of U1100 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	U110087	LIN communication: blower message not received Brand	Network

6Related codes

Browse Uxxx codes or U110xx codes.