NetworkU3000

Serious

Severity: Serious - have it checked soon

Control Module

30 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 30

Brand	Code	Description	System
Ashok Leyland CV	U3000	Control Module SAE	Network
BAIC Motor	U3000	Control Module Brand	Network
Mercedes-Benz	U3000	Control Module SAE	Network
BYD	U3000	Control Module Brand	Network
Chery	U3000	Control Module Brand	Network
Daewoo	U3000	Control Module Brand	Network
DFFS	U3000	Control Module Brand	Network
DFFX	U3000	Control Module Brand	Network
DFXK	U3000	Control Module Brand	Network
EOBD	U3000	Styrenhet Brand	Network
Ford	U3000	WAS Found! Brand	Network
Geely	U3000	Control Module Brand	Network
GM	U3000	Control Module SAE	Network
Great Wall	U3000	Control Module Brand	Network
Hafei	U3000	Control Module Brand	Network
Holden	U3000	Control Module SAE	Network
Honda	U3000	Control Module SAE	Network
Hyundai	U3000	Control Module SAE	Network
Land Rover	U3000	Control Module - Internal Electronic Failure Brand	Network
Mazda	U3000	Memory Failure Brand	Network
Mitsubishi	U3000	Control Module SAE	Network
Opel	U3000	Control Module Brand	Network
Peugeot	U3000	Control Module SAE	Network
Proton	U3000	Control Module SAE	Network
Saab	U3000	Control Module Brand	Network
MG (SAIC)	U3000	Control Module Brand	Network
Sprinter	U3000	Control Module SAE	Network
Tata	U3000	Control Module SAE	Network
Toyota	U3000	Control module Brand	Network
Volkswagen	U3000	Control Module SAE	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 42

These 7-character codes are manufacturer-specific variants of U3000 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U300000	Monitoring level 2 MU_Error_Md Brand	Network
SsangYong	U300000	Software bug (function supervision) Brand	Network
Volvo	U300000	Due to this fault one or several Diagnostic trouble codes (DTCs) CEM-U043300, SRS-U043300, CVM- has/have been stored Brand	Network
Mercedes-Benz	U300001	No description available	Network
Sprinter	U300001	E3 Sw ErrorSopc Brand	Network
Volvo	U300001	If the customer returns repeatedly to the workshop with the DTC SRS- set, this may indicate that the battery voltage is poor Brand	Network
Mercedes-Benz	U300002	No description available	Network
Sprinter	U300002	software error in errorhandler (only development) Brand	Network
Mercedes-Benz	U300004	The control unit has a malfunction due to redundant monitoring. There is an internal fault. Brand	Network
Sprinter	U300004	software error in variable pool (only development) Brand	Network
Mercedes-Benz	U300005	No description available	Network
Sprinter	U300005	Lockstep fault Brand	Network
Mercedes-Benz	U300006	No description available	Network
Sprinter	U300006	software error in time based memory management (only development) Brand	Network
Volvo	U300006	If DTC FSM- is stored, prioritise its fault tracing Brand	Network
Mercedes-Benz	U300016	The control unit has a malfunction due to redundant monitoring. The limit value for electrical voltage has not been attained. Brand	Network
Mercedes-Benz	U300019	The control unit has a malfunction due to redundant monitoring. The limit value for current has been exceeded. Brand	Network
Mercedes-Benz	U300042	The control unit has a malfunction due to redundant monitoring. There is a general memory error. Brand	Network
Mercedes-Benz	U300043	The control unit has a malfunction due to redundant monitoring. There is an error in the additional memory. Brand	Network
Mercedes-Benz	U300044	No description available	Network
Land Rover	U300044	No description available	Network
Sprinter	U300044	Memory: RAM check failed Brand	Network
Sprinter	U300045	NVRAM Error Brand	Network
Mercedes-Benz	U300046	No description available	Network
Mercedes-Benz	U300047	The control unit has a malfunction due to redundant monitoring. There is a runtime error. Brand	Network
Sprinter	U300047	Error in task monitoring Brand	Network
Mercedes-Benz	U300049	The control unit has a malfunction due to redundant monitoring. There is an internal electrical fault. Brand	Network
Sprinter	U300049	Error signal plausibility Brand	Network
Volvo	U300049	If DTC CEM- is active in the vehicle, troubleshoot as shown in this troubleshooting guide instead Brand	Network
Land Rover	U30004A	No description available	Network
Sprinter	U300057	E3 SW error Brand	Network
Mercedes-Benz	U300062	The control unit has a malfunction due to redundant monitoring. The signal comparison is faulty. Brand	Network
Mercedes-Benz	U300064	The control unit has a malfunction due to redundant monitoring. There is an implausible signal. Brand	Network
Mercedes-Benz	U300081	No description available	Network
Mercedes-Benz	U300082	The control unit has a malfunction due to redundant monitoring. The instruction counter is not updated. Brand	Network
Mercedes-Benz	U300087	The control unit has a malfunction due to redundant monitoring. The message is missing. Brand	Network
Mercedes-Benz	U30008C	The control unit has a malfunction due to redundant monitoring. Brand	Network
Sprinter	U300092	Fault check of customer mode handling - level2 mode MU error customer interface Brand	Network
Sprinter	U300093	No description available	Network
Land Rover	U300098	No description available	Network
Mercedes-Benz	U3000A2	The control unit has a malfunction due to redundant monitoring. The system voltage is too low. Brand	Network
Mercedes-Benz	U3000A3	The control unit has a malfunction due to redundant monitoring. The system voltage is too high. Brand	Network

6Related codes

Browse Uxxx codes or U300xx codes.