NetworkU0001

Serious

Severity: Serious - have it checked soon

High Speed CAN Communication Bus

41 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 41

Brand	Code	Description	System
Ashok Leyland CV	U0001	High Speed CAN Communication Bus SAE	Network
BAIC Motor	U0001	CAN bus off Brand	Network
Mercedes-Benz	U0001	High Speed CAN Communication Bus SAE	Network
BYD	U0001	CAN bus fault Brand	Network
Chery	U0001	CAN bus off error Brand	Network
Chrysler	U0001	CAN C Bus Brand	Network
Daewoo	U0001	High Speed CAN Communication Bus SAE	Network
Daihatsu	U0001	CAN communication Brand	Network
DFFS	U0001	Bus off Brand	Network
DFFX	U0001	CAN communication failure Brand	Network
DFXK	U0001	CAN Bus Off Error Brand	Network
EOBD	U0001	Korkeanopeuksinen CAN-väylä Brand	Network
Fiat	U0001	CAN C Bus Brand	Network
Ford	U0001	High Speed CAN Communication Bus SAE	Network
Geely	U0001	CAN bus off Brand	Network
GM	U0001	High Speed CAN Communication Bus Brand	Network
Great Wall	U0001	CAN bus fault Brand	Network
Hafei	U0001	High Speed CAN Communication Bus Brand	Network
Holden	U0001	High Speed CAN Bus Brand	Network
Hyundai	U0001	High Speed CAN Communication Bus SAE	Network
Isuzu	U0001	High Speed CAN Communication Bus SAE	Network
Land Rover	U0001	High Speed CAN Communication Bus SAE	Network
Mahindra	U0001	High Speed CAN Communication Bus SAE	Network
Maserati	U0001	CAN C bus missing message Brand	Network
Mazda	U0001	steering angle, wheel speed and lateral acceleration. If one or more of these messages is missing for more than 5 seconds (1 second for wheel speed) and the PSCM(Power Steering Control Module) has not set DTC: 88, then the PSCM(Power Steering Control Module) will set U0121:00 Brand	Network
Mitsubishi	U0001	Bus error Brand	Network
Opel	U0001	High Speed CAN Communication Bus Brand	Network
Perodua	U0001	CAN communication Brand	Network
Peugeot	U0001	High Speed CAN Communication Bus SAE	Network
Porsche	U0001	High Speed CAN Communication Bus SAE	Network
Proton	U0001	Bus error Brand	Network
Saab	U0001	High Speed CAN Communication Bus Brand	Network
MG (SAIC)	U0001	CAN Bus Off Brand	Network
Smart	U0001	High Speed CAN Communication Bus SAE	Network
Sprinter	U0001	High Speed CAN Communication Bus SAE	Network
Subaru	U0001	High Speed CAN Communication Bus SAE	Network
Suzuki	U0001	High speed CAN communication bus Brand	Network
SWM Motor	U0001	High speed CAN defectiv Brand	Network
Tata	U0001	CAN Bus off failure Brand	Network
Toyota	U0001	CAN bus off Brand	Network
Volkswagen	U0001	Powertrain databus: Unspecified malfunction; Defective 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 29

These 7-character codes are manufacturer-specific variants of U0001 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U000100	CAN bus-off recognized Brand	Network
Hyundai	U000100	is set when signal transmission through CAN communication line is impossible for more than 0.9 sec. because of open or short to ground in CAN communication line. Checking CAN communication BUS and signals from ECM, TCM module is required Brand	Network
SsangYong	U000100	CAN: controller 2 communication interrupted (bus off) Brand	Network
SsangYong	U000186	CAN communication: no communication on indirect channel 1 Brand	Network
Mercedes-Benz	U000187	Message Lost communication with COM modue. missing message Brand	Network
Mercedes-Benz	U000188	High Speed CAN Communication Bus. BusOff. Brand	Network
Smart	U000188	No description available	Network
SsangYong	U000188	CAN communication: no communication on channel 1 Brand	Network
Mercedes-Benz	U000189	ECU Hardware Failure Brand	Network
Mercedes-Benz	U00018C	Video Output Sync Error Brand	Network
Mercedes-Benz	U00018D	FIR Camera Authentication Error Brand	Network
Mercedes-Benz	U00018E	ECU/Vehicle Pairing Error Brand	Network
Mercedes-Benz	U00018F	ECU Boot Timeout Brand	Network
Mercedes-Benz	U000190	ECU Boot Error Brand	Network
Mercedes-Benz	U000191	FIR Camera Error Brand	Network
Mercedes-Benz	U000193	FIR Camera Link Error Brand	Network
Mercedes-Benz	U000194	FIR Camera High Current Brand	Network
Mercedes-Benz	U000195	NIR Camera Error Brand	Network
Mercedes-Benz	U000196	NIR Camera Link Error Brand	Network
Mercedes-Benz	U000197	NIR Camera High Current Brand	Network
Mercedes-Benz	U000198	IR Illuminator defective Brand	Network
Mercedes-Benz	U000199	ECU Watchdog Error Brand	Network
Mercedes-Benz	U00019A	ECU Temperature High Brand	Network
Mercedes-Benz	U00019B	ECU High Current Brand	Network
Mercedes-Benz	U00019D	FIR Temperature High Brand	Network
Mercedes-Benz	U00019E	NIR Temperature High Brand	Network
Mercedes-Benz	U0001A1	ECU DSP Flash Failure Brand	Network
Mercedes-Benz	U0001A2	ECU Headlight Failure Brand	Network
Mercedes-Benz	U0001A3	FIR NIR Alignment Failure Brand	Network

6Related codes

Browse Uxxx codes or U000xx codes.