Error code
OBD2 U0164
OBD2U0164
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Lost Communication With HVAC Control Module.
Severity
moderateCan drive, but HVAC functions may be impaired.
Summary
U0164 indicates that the car's computer system is unable to communicate with the HVAC control module, which manages heating, ventilation, and air conditioning functions. This issue affects the data bus connected to the NC (not specified) control module.
Symptoms
- HVAC system not functioning
- Check Engine light on
Common Causes
- Faulty HVAC control module
- Data communication line malfunction or disconnection
- Power supply issues for the HVAC control module
Fixes
- Replace faulty HVAC control module or repair data communication line
FAQ
How do I diagnose U0164?
Use a diagnostic tool like Torque Pro to check for additional codes and inspect the physical connections between the HVAC control module and the vehicle's data bus.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- U0100Lost Communication With ECM/PCM A
- U0101Lost Communication with TCM
- U0102Lost Communication with Transfer Case Control Module
- U0103Lost Communication With Gear Shift Module
- U0104Lost Communication With Cruise Control Module
- U0105Lost Communication With Fuel Injector Control Module
- U0106Lost Communication With Glow Plug Control Module
- U0107Lost Communication With Throttle Actuator Control Module
- U0108Lost Communication With Alternative Fuel Control Module
- U0109Lost Communication With Fuel Pump Control Module
- U0110Lost Communication With Drive Motor Control Module
- U0111Lost Communication With Battery Energy Control Module 'A'