NetworkU1118

Serious

Severity: Serious - have it checked soon

Communication failure with Built-in System Interface (BSI)

23 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 23

Brand	Code	Description	System
Mercedes-Benz	U1118	Valid except code 567 Brand	Network
Daewoo	U1118	Loss of serial communications for class 2 devices Brand	Network
Daihatsu	U1118	Lost communication with rear radar sensor Brand	Network
DFFS	U1118	CAN and BCM communication timeout Brand	Network
DFFX	U1118	CAN and SRS communication timeout Brand	Network
EOBD	U1118	Dataset saknas Brand	Network
GM	U1118	Loss of serial communications for class 2 devices Brand	Network
Holden	U1118	Lost Communication with Radio Brand	Network
Hyundai	U1118	No description available	Network
Mahindra	U1118	No description available	Network
Maserati	U1118	Lost Engine Variant Message Brand	Network
Mitsubishi	U1118	4WD CAN timeout Brand	Network
Nissan	U1118	No description available	Network
Opel	U1118	Loss of serial communications for class 2 devices Brand	Network
Perodua	U1118	Lost communication with rear radar sensor Brand	Network
Peugeot	U1118	No description available	Network
Proton	U1118	4WD CAN timeout Brand	Network
Saab	U1118	Loss of serial communications for class 2 devices Brand	Network
Smart	U1118	Valid except code 567 Brand	Network
Sprinter	U1118	Valid except code 567 Brand	Network
Suzuki	U1118	LOST COMM (AV C/U) Brand	Network
Tata	U1118	No description available	Network
Toyota	U1118	Communication failure with Built-in System Interface (BSI) 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 11

These 7-character codes are manufacturer-specific variants of U1118 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U111800	The traction system has detected implausible data 1. Brand	Network
Porsche	U111800	No description available	Network
SsangYong	U111802	CAN communication: MCU_1E1 communication error - timeout Brand	Network
Mercedes-Benz	U111804	The traction system has detected implausible data 1. There is an internal fault. Brand	Network
Mercedes-Benz	U111809	The traction system has detected implausible data 1. There is a component fault. Brand	Network
Mercedes-Benz	U111844	The traction system has detected implausible data 1. There is an error in the data memory. Brand	Network
Mercedes-Benz	U111864	The traction system has detected implausible data 1. There is an implausible signal. Brand	Network
Mercedes-Benz	U1118EA	Receive of data not finished within defined time Brand	Network
Mercedes-Benz	U1118EC	Failure is set when PRW functionality developed by 3rd party tries to access memory region outside of its allocated memory Brand	Network
Mercedes-Benz	U1118FA	The traction system has detected implausible data 1. Brand	Network
Mercedes-Benz	U1118FD	The traction system has detected implausible data 1. Brand	Network

6Related codes

Browse Uxxx codes or U111xx codes.