NetworkU1321

Serious

Severity: Serious - have it checked soon

Communication failure with electric steering ECU

21 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. Steering effort may increase.

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 21

Brand	Code	Description	System
BYD	U1321	Data Length Error Brand	Network
Chery	U1321	Data Length Error Brand	Network
Daewoo	U1321	No description available	Network
DFFS	U1321	Communication failure with electric steering ECU Brand	Network
DFFX	U1321	Data Length Error Brand	Network
EOBD	U1321	Intersystem-CAN Brand	Network
Geely	U1321	Data Length Error Brand	Network
GM	U1321	No description available	Network
Great Wall	U1321	Data Length Error Brand	Network
Hafei	U1321	Data Length Error Brand	Network
Holden	U1321	Invalid Data Received From Power Steering Control Module Brand	Network
Mitsubishi	U1321	Data Length Error Brand	Network
Nissan	U1321	not configurated Brand	Network
Opel	U1321	No description available	Network
Peugeot	U1321	No description available	Network
Proton	U1321	Data Length Error Brand	Network
Saab	U1321	No description available	Network
Subaru	U1321	No description available	Network
Suzuki	U1321	CONFIGURATION DATA ERROR Brand	Network
Tata	U1321	No description available	Network
Toyota	U1321	Communication failure with electric steering ECU 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 U1321 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	U132104	DIO: input channel error Brand	Network

6Related codes

Browse Uxxx codes or U132xx codes.