U0164: Lost Communication With HVAC Control Module
3 vehicles · 3 makes · $100-$1,000 repair
Most Reported On
U0164 is an OBD-II diagnostic trouble code meaning “Lost Communication With HVAC Control Module.” This network code means another module on the vehicle's communication bus stopped receiving expected messages from the HVAC (climate control) module. Modern vehicles share data over networks like CAN, and when the HVAC module goes silent for too long, this code is set. It usually points to a power, ground, wiring, or bus fault rather than a climate-comfort issue itself. Climate controls may stop responding correctly, but it does not affect the vehicle's ability to drive. This code is most commonly reported on 2015-2022 Ford Transit, 2004-2008 Chrysler Crossfire, and 2015-2020 GMC Sierra 3500HD, with repair costs ranging from $100 to $1,000.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose U0164, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (3)
FAQ
What does U0164 mean?
U0164 stands for "Lost Communication With HVAC Control Module." This network code means another module on the vehicle's communication bus stopped receiving expected messages from the HVAC (climate control) module. Modern vehicles share data over networks like CAN, and when the HVAC module goes silent for too long, this code is set. It usually points to a power, ground, wiring, or bus fault rather than a climate-comfort issue itself. Climate controls may stop responding correctly, but it does not affect the vehicle's ability to drive.
What are the most common causes of U0164?
The most common causes of U0164 are: Loss of power or ground to the HVAC module, Wiring or connector fault on the communication bus, Corroded or loose HVAC module connector, Faulty HVAC control module, Network/bus wiring damage or short affecting multiple modules, Gateway or related module fault disrupting the bus. The specific cause varies by vehicle.
How much does it cost to fix U0164?
Repair costs for U0164 range from $100 to $1,000, depending on the vehicle and root cause.
Which vehicles are affected by U0164?
Au7o has documented U0164 across 3 vehicle models from 3 manufacturers: Chrysler, Ford, GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.