NetworkU0019

Serious

Severity: Serious - have it checked soon

Low Speed CAN Communication Bus

28 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list

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 28

Brand	Code	Description	System
Ashok Leyland CV	U0019	Low Speed CAN Communication Bus SAE	Network
BAIC Motor	U0019	Low Speed CAN Communication Bus Brand	Network
Mercedes-Benz	U0019	Low Speed CAN Communication Bus SAE	Network
BYD	U0019	Low Speed CAN Communication Bus Brand	Network
Chery	U0019	Low Speed CAN Communication Bus Brand	Network
Daewoo	U0019	Low Speed CAN Communication Bus Brand	Network
DFFS	U0019	Low Speed CAN Communication Bus Brand	Network
DFFX	U0019	Low Speed CAN Communication Bus Brand	Network
DFXK	U0019	Low Speed CAN Communication Bus Brand	Network
EOBD	U0019	Low speed CAN communicatiebus Brand	Network
Ford	U0019	Low Speed CAN Communication Bus SAE	Network
Geely	U0019	Low Speed CAN Communication Bus Brand	Network
GM	U0019	Low Speed CAN Communication Bus Brand	Network
Great Wall	U0019	Low Speed CAN Communication Bus Brand	Network
Hafei	U0019	Low Speed CAN Communication Bus Brand	Network
Holden	U0019	Low Speed CAN Bus Brand	Network
Hyundai	U0019	Low Speed CAN Communication Bus SAE	Network
Land Rover	U0019	Low speed CAN communication bus Brand	Network
Maserati	U0019	CAN B bus missing message Brand	Network
Mazda	U0019	Low Speed CAN Communication Bus SAE	Network
Mitsubishi	U0019	Bus error Brand	Network
Opel	U0019	Low Speed CAN Communication Bus Brand	Network
Peugeot	U0019	Low Speed CAN Communication Bus SAE	Network
Proton	U0019	Bus error Brand	Network
Saab	U0019	Low Speed CAN Communication Bus Brand	Network
MG (SAIC)	U0019	Low Speed CAN Communication Bus Brand	Network
Tata	U0019	Low Speed CAN Communication Bus Brand	Network
Toyota	U0019	Communication between intelligent control box and engine compartment fuse box 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 U0019 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U001900	Interior CAN communication has a malfunction. Brand	Network
SsangYong	U001900	M-CAN Bus-off Brand	Network
Mercedes-Benz	U001902	Die Kommunikation mit dem Innenraum-CAN-Bus hat Funktionsstörung. Es liegt ein allgemeiner Signalfehler vor. Brand	Network
Mercedes-Benz	U001911	Die Innenraum-CAN-Kommunikation hat Funktionsstörung. Es liegt ein Kurzschluss nach Masse vor. Brand	Network
Mercedes-Benz	U001914	Die Kommunikation mit dem Innenraum-CAN-Bus hat Funktionsstörung. Es liegt ein Kurzschluss nach Masse. Brand	Network
Mercedes-Benz	U001987	Interior CAN communication has a malfunction. The message is missing. Brand	Network
Mercedes-Benz	U001988	Body CAN Communication. Bus OFF. Brand	Network
Sprinter	U001988	No description available	Network

6Related codes

Browse Uxxx codes or U001xx codes.