NetworkU0073

Serious

Severity: Serious - have it checked soon

Control Module Communication Bus A Off

40 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 40

Brand	Code	Description	System
Ashok Leyland CV	U0073	Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector) Brand	Network
BAIC Motor	U0073	CAN Bus off Brand	Network
Mercedes-Benz	U0073	Control Module Communication Bus A Off SAE	Network
BYD	U0073	CAN bus off Brand	Network
Chery	U0073	Bus off Brand	Network
Daewoo	U0073	CAN-Bus OFF Status/procedure text, not a fault description. Brand	Network
Daihatsu	U0073	CAN reception abnormal Brand	Network
DFFS	U0073	Bus off Brand	Network
DFFX	U0073	CAN bus off Brand	Network
DFXK	U0073	CAN bus off Brand	Network
EOBD	U0073	Juhtmoduli sidebuss 'A' väljas Brand	Network
Ford	U0073	39 = CAN(Controller Area Network) communication failure Brand	Network
Geely	U0073	CAN bus fault Brand	Network
GM	U0073	Control module communication bus off Brand	Network
Great Wall	U0073	CAN bus off Brand	Network
Hafei	U0073	Control Module Communication Bus 'A' Off Brand	Network
Holden	U0073	High Speed CAN Bus Brand	Network
Honda	U0073	Control Module Communication Bus A Off SAE	Network
Hyundai	U0073	Control Module Communication Bus A Off SAE	Network
Isuzu	U0073	Control Module Communication Bus A Off SAE	Network
Land Rover	U0073	Control Module Communication Bus A Off SAE	Network
Mahindra	U0073	Control Module Communication Bus A Off SAE	Network
Mazda	U0073	39 = CAN(Controller Area Network) communication failure Brand	Network
Mitsubishi	U0073	CAN bus off Brand	Network
Nissan	U0073	Control Module Communication Bus A Off SAE	Network
Opel	U0073	Control module communication bus off Brand	Network
Perodua	U0073	CAN reception abnormal Brand	Network
Peugeot	U0073	Communication fault on the CAN - not characterised Brand	Network
Porsche	U0073	Control Module Communication Bus A Off SAE	Network
Proton	U0073	CAN bus off Brand	Network
Saab	U0073	Kommunikationsbus Steuergerät Aus Brand	Network
Maxus (SAIC)	U0073	PT bus off Brand	Network
MG (SAIC)	U0073	PT bus off Brand	Network
Smart	U0073	Control Module Communication Bus A Off SAE	Network
Sprinter	U0073	Control Module Communication Bus A Off SAE	Network
Subaru	U0073	Control Module Communication Bus A Off SAE	Network
Suzuki	U0073	DTC LCU CAN ADBDRIVER OFF Brand	Network
SWM Motor	U0073	CAN bus shutdown fault Brand	Network
Tata	U0073	Control Module Communication Bus Off Brand	Network
Toyota	U0073	CAN bus off 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 7

These 7-character codes are manufacturer-specific variants of U0073 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	U007300	Control Module Communication Bus 'A' Off Brand	Network
SsangYong	U007300	CAN bus: CAN bus off Brand	Network
Mercedes-Benz	U007301	Antriebs-CAN-Bus-OFF-Fehler Es liegt ein allgemeiner elektrischer Fehler vor. Brand	Network
Volvo	U00732B	No description available	Network
Mercedes-Benz	U007388	Drive train CAN bus OFF fault Bus OFF Brand	Network
SsangYong	U007388	CAN communication: no communication - bus off Brand	Network
Volvo	U007388	No description available	Network

6Related codes

Browse Uxxx codes or U007xx codes.