U0164 to U0169: climate, immobilizer, alarm and sunroof modules
A module stopped receiving messages from the climate control (HVAC), the auxiliary heater, the immobilizer, the vehicle security module or the sunroof.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does U0164 mean?
These are comfort and security modules. The climate control runs the blower, the air distribution and the air conditioning; an auxiliary heater warms the cabin or the engine on some diesels and cars built for cold climates; the immobilizer checks the key before the engine is allowed to start; the security module runs the alarm. When one drops off the network, its feature stops working, and a lost immobilizer can mean the engine will not start or stops seconds after starting.
What causes U0164?
- A blown fuse for the climate control or the blower, sometimes after the blower motor seized
- A connector behind the dashboard disturbed by radio or dashboard work
- Water from a blocked sunroof drain reaching the sunroof module or the wiring under the headliner
- A failed immobilizer module or antenna ring around the ignition
- A weak key fob battery confusing the immobilizer on some cars
What to check first for U0164
- Check whether the climate control, the alarm and the sunroof respond
- Look for stains on the headliner or water in the footwells from the sunroof drains
- Check the fuses for the module this code names
- If the engine will not start, try the spare key before replacing parts
Can you drive with U0164?
Usually you can drive to a workshop. Do not set off unless you can see clearly if the climate control has stopped and the windshield fogs, and avoid switching off far from home with an immobilizer code stored, because the engine may not start again.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
- U0164Lost Communication With HVAC Control Module
- U0165Lost Communication With HVAC Control Module
- U0166Lost Communication With Auxiliary Heater Control Module
- U0167Lost Communication With Vehicle Immobilizer Control Module
- U0168Lost Communication With Vehicle Security Control Module
- U0169Lost Communication With Sunroof Control Module
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
