NetworkU0103

Serious

Severity: Serious - have it checked soon

Lost Communication With Gear Shift Module

38 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 38

Brand	Code	Description	System
Ashok Leyland CV	U0103	Not Available Brand	Network
BAIC Motor	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Mercedes-Benz	U0103	Lost Communication With Gear Shift Module SAE	Network
BYD	U0103	Lost communication with MG Brand	Network
Chery	U0103	lost communication with ICM module Brand	Network
Chrysler	U0103	Lost Communication With Electric Gear Shift Module Brand	Network
Daewoo	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
DFFS	U0103	Communication with TCU lost Brand	Network
DFFX	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
DFXK	U0103	No Communication with Gear Selector Module Brand	Network
EOBD	U0103	Communicatieverlies met schakelmodule A Brand	Network
Fiat	U0103	Lost communication with electric gear shift module Brand	Network
Geely	U0103	Shift Lever CAN Signal Invalid Brand	Network
GM	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Great Wall	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Hafei	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Holden	U0103	Lost Communication with Shift Lever Module Brand	Network
Honda	U0103	Lost Communication With Gear Shift Module SAE	Network
Hyundai	U0103	Lost Communication With Gear Shift Module SAE	Network
Isuzu	U0103	Lost Communication With Gear Shift Module SAE	Network
Land Rover	U0103	Lost Communication With Gear Shift Module SAE	Network
Maserati	U0103	lost communication with electric gear shift module Brand	Network
Mitsubishi	U0103	Shift lever CAN timeout Brand	Network
Nissan	U0103	Lost Communication With Gear Shift Module SAE	Network
Opel	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Peugeot	U0103	Lost Communication With Gear Shift Module SAE	Network
Porsche	U0103	Lost Communication With Gear Shift Module SAE	Network
Proton	U0103	Shift lever CAN timeout Brand	Network
Saab	U0103	Lost Communication With Gear Shift Control Module A Brand	Network
Maxus (SAIC)	U0103	Lost Communication With ETRS Brand	Network
MG (SAIC)	U0103	Loss Communication With SCU Brand	Network
Smart	U0103	Lost Communication With Gear Shift Module SAE	Network
Sprinter	U0103	Lost Communication With Gear Shift Module SAE	Network
Subaru	U0103	Lost Communication With Gear Shift Module SAE	Network
Suzuki	U0103	Lost Communication With Gear Shift Control Module “A' – Missing Message Brand	Network
Tata	U0103	Lost Communication With Gear Shift Module Brand	Network
Toyota	U0103	Communication between CAN and transmission control module lost Brand	Network
Volkswagen	U0103	No Communication with Gear Selector Module 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 3

These 7-character codes are manufacturer-specific variants of U0103 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U010300	Communication with the electronic selector lever module has a malfunction. Brand	Network
SsangYong	U010300	CAN communication: Throttle Position Sensor (TGS) lever message not received Brand	Network
SsangYong	U010387	CAN communication: Transmission Control Unit (TCU)/EWM message not received Brand	Network

6Related codes

Browse Uxxx codes or U010xx codes.