NetworkU0164

Serious

Severity: Serious - have it checked soon

Lost Communication With HVAC Control Module

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	U0164	Lost Communication With HVAC Control Module SAE	Network
BAIC Motor	U0164	AC communication fault Brand	Network
Mercedes-Benz	U0164	Lost Communication With HVAC Control Module SAE	Network
BYD	U0164	Lost communication with AC Brand	Network
Chery	U0164	Lost communication with CLM Brand	Network
Daewoo	U0164	Lost Communication With HVAC Control Module Brand	Network
Daihatsu	U0164	A/C communication Brand	Network
DFFS	U0164	Lost Communication With HVAC Control Module Brand	Network
DFFX	U0164	Lost Communication With HVAC Control Module Brand	Network
DFXK	U0164	ECM lost communication with HVAC Brand	Network
EOBD	U0164	Kaotatud side HVAC juhtmooduliga Brand	Network
Ford	U0164	Lost Communication With HVAC Control Module SAE	Network
Geely	U0164	Lost Communication With HVAC Control Module Brand	Network
GM	U0164	Comunicación Perdida con Mód Ctrl HVAC Brand	Network
Great Wall	U0164	Lost Communication With HVAC Control Module Brand	Network
Hafei	U0164	Lost Communication With HVAC Control Module Brand	Network
Holden	U0164	Lost Communication with HVAC Control Module Brand	Network
Honda	U0164	Lost Communication With HVAC Control Module SAE	Network
Hyundai	U0164	Lost Communication With HVAC Control Module SAE	Network
Isuzu	U0164	Lost Communication With HVAC Control Module SAE	Network
Land Rover	U0164	Lost Communication With HVAC Control Module SAE	Network
Maserati	U0164	Lost Communication With HVAC Control Module Brand	Network
Mazda	U0164	Lost Communication With HVAC Control Module SAE	Network
Mitsubishi	U0164	A/C CAN timeout Brand	Network
Nissan	U0164	Lost Communication With HVAC Control Module SAE	Network
Opel	U0164	Comunicación Perdida con Mód Ctrl HVAC Brand	Network
Perodua	U0164	A/C communication Brand	Network
Peugeot	U0164	Lost Communication With HVAC Control Module SAE	Network
Porsche	U0164	Lost Communication With HVAC Control Module SAE	Network
Proton	U0164	A/C CAN timeout Brand	Network
Saab	U0164	Verbindungsverlust zum HLK-Steuergerät Brand	Network
Maxus (SAIC)	U0164	lost communication with HCM Brand	Network
MG (SAIC)	U0164	Missing ATC Brand	Network
Smart	U0164	Lost Communication With HVAC Control Module SAE	Network
Sprinter	U0164	Lost Communication With HVAC Control Module SAE	Network
Subaru	U0164	Lost Communication With HVAC Control Module SAE	Network
Suzuki	U0164	Lost Communication With HVAC Control Module Brand	Network
Tata	U0164	Lost Communication With HVAC Control Module Brand	Network
Toyota	U0164	Lost communication with HVAC control module Brand	Network
Volkswagen	U0164	No communications with HVAC control module (J301); Short to plus 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 6

These 7-character codes are manufacturer-specific variants of U0164 and may be reported by some scan tools.

Brand	Code	Description	System
Porsche	U016400	Lost Communication With HVAC Control Module Brand	Network
SsangYong	U016400	CAN communication bus with HVAC (timeout) Brand	Network
Mercedes-Benz	U016483	value of signal protection calculation incorrect Message error with AC control unit- (Klimabediengerte) Brand	Network
Mercedes-Benz	U016486	Toggle bit from HVAC module failed. - signal invalid Brand	Network
Mercedes-Benz	U016487	missing message Message lost with AC control unit- (Klimabediengerte) Brand	Network
SsangYong	U016487	CAN communication: Electric Heating, Ventilation, and Air Conditioning (EHVC) message not received Brand	Network

6Related codes

Browse Uxxx codes or U016xx codes.