OBD-II Code · Network
U0164
Lost Communication with HVAC Control Module
low severitySafe to drive$200-$800
HVAC module comm lost.
Common symptoms
- HVAC inoperative
Likely causes
- Failed HVAC module
- Wiring
Where to start
- Try the cheapest cause first. Start by checking: failed hvac module.
- Cost & scope. $200-$800
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
Related codes
P0600Serial Communication LinkU0001High Speed CAN Communication BusU0002High Speed CAN Communication Bus PerformanceU0010Medium Speed CAN Communication BusU0073Control Module Communication Bus A OffU0076Control Module Communication Bus B OffU0100Lost Communication with ECM/PCMU0101Lost Communication with TCM
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