NetworkU1005

Serious

Severity: Serious - have it checked soon

CAN network

24 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 24

Brand	Code	Description	System
Ashok Leyland CV	U1005	Mass Or Volume Air Flow Circuit Range/Performance Problem. Sensor A. - Air Flow Mass. Too High Brand	Network
Mercedes-Benz	U1005	No description available	Network
BYD	U1005	CAN short to power Brand	Network
Chery	U1005	Brake system module CAN signal fault Brand	Network
Daewoo	U1005	Loss of serial communications for class 2 devices Brand	Network
DFFX	U1005	The transmission control unit (TCU) has lost contact with the mode signal system Brand	Network
DFXK	U1005	No description available	Network
EOBD	U1005	CAN mreža Brand	Network
Geely	U1005	BCM LIN Communication Error Brand	Network
GM	U1005	Loss of serial communications for class 2 devices Brand	Network
Honda	U1005	No description available	Network
Hyundai	U1005	No description available	Network
Isuzu	U1005	No description available	Network
Land Rover	U1005	与 iPod 模块的通信丢失 Brand	Network
Mahindra	U1005	No description available	Network
Mitsubishi	U1005	CNR/Back SNS./Sonar CAN timeout Brand	Network
Peugeot	U1005	No description available	Network
Proton	U1005	CNR/Back SNS./Sonar CAN timeout Brand	Network
Saab	U1005	Loss of serial communications for class 2 devices Brand	Network
MG (SAIC)	U1005	Lost Communication with Ultrasonic Alarm Sensor Module Brand	Network
Smart	U1005	No description available	Network
Sprinter	U1005	No description available	Network
Toyota	U1005	CAN network Brand	Network
Volkswagen	U1005	No description available	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 2

These 7-character codes are manufacturer-specific variants of U1005 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U100500	U100500 - DTC not currently used Brand	Network
SsangYong	U100587	CAN: missing PASEM message Brand	Network

6Related codes

Browse Uxxx codes or U100xx codes.