NetworkU1126

Serious

Severity: Serious - have it checked soon

EPS (CAN message)

23 brands affected · Description from Toyota data.

Key terms: Control module: a small computer that runs one part of the car

Safety: This code relates to the steering system. Power steering assistance may be reduced or fail.

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	U1126	Valid except model 118, 177, 247 Brand	Network
BYD	U1126	No description available	Network
Chery	U1126	No description available	Network
Daewoo	U1126	Loss of serial communications for class 2 devices Brand	Network
DFFS	U1126	Gateway node lost Brand	Network
DFFX	U1126	No description available	Network
EOBD	U1126	No description available	Network
Geely	U1126	No description available	Network
GM	U1126	Loss of serial communications for class 2 devices Brand	Network
Great Wall	U1126	No description available	Network
Hafei	U1126	No description available	Network
Hyundai	U1126	If the 4WD ECU doesn't get some ESC signals from ESC moduel, it sets Brand	Network
Mahindra	U1126	No description available	Network
Mitsubishi	U1126	No description available	Network
Peugeot	U1126	No description available	Network
Proton	U1126	No description available	Network
Saab	U1126	Loss of serial communications for class 2 devices Brand	Network
Maxus (SAIC)	U1126	DTC configuration: Lost communication with HVAC Brand	Network
MG (SAIC)	U1126	DTC configuration: Lost communication with HVAC Brand	Network
Smart	U1126	Valid except model 118, 177, 247 Brand	Network
Sprinter	U1126	Valid except model 118, 177, 247 Brand	Network
Suzuki	U1126	Lost Communication With Steering Angle Sensor Module Brand	Network
Toyota	U1126	EPS (CAN message) 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.

5Related codes

Browse Uxxx codes or U112xx codes.