NetworkU1400

Serious

Severity: Serious - have it checked soon

Alternator LIN network failure

27 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 charging system. The battery may go flat and the car may stall.

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 27

Brand	Code	Description	System
Mercedes-Benz	U1400	No description available	Network
BYD	U1400	Data Error Brand	Network
Chery	U1400	Data Error Brand	Network
Chrysler	U1400	RBM fault Brand	Network
Daewoo	U1400	No description available	Network
DFFS	U1400	Generator LIN network failure Brand	Network
DFFX	U1400	Data Error Brand	Network
EOBD	U1400	LIN-linje Brand	Network
Fiat	U1400	Implausible TPS signal received Brand	Network
Geely	U1400	Data Error Brand	Network
GM	U1400	No description available	Network
Great Wall	U1400	Data Error Brand	Network
Hafei	U1400	Data Error Brand	Network
Holden	U1400	Invalid Data Received From Generator Control Module Brand	Network
Honda	U1400	No description available	Network
Isuzu	U1400	No description available	Network
Maserati	U1400	implausible Throttle Position Sensor (TPS) signal received Brand	Network
Mitsubishi	U1400	Data Error Brand	Network
Opel	U1400	No description available	Network
Peugeot	U1400	No description available	Network
Proton	U1400	Data Error Brand	Network
Saab	U1400	No description available	Network
MG (SAIC)	U1400	Can Invalid Signal accelerator Position Brand	Network
Sprinter	U1400	No description available	Network
Tata	U1400	No description available	Network
Toyota	U1400	Alternator LIN network failure Brand	Network
Volkswagen	U1400	Function Restricted due to Insufficient Voltage 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 2

These 7-character codes are manufacturer-specific variants of U1400 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	U140000	CAN: error in accelerator pedal position(from MS) signal value (invalid) Brand	Network
Volkswagen	U140000	Functional impairment Brand	Network

6Related codes

Browse Uxxx codes or U140xx codes.