U0164 — Lost Communication With HVAC Control Module
Category: Network / Communication Severity: Low
Updated:
DTC code U0164 means: Lost Communication With HVAC Control Module. It falls under the "Network / Communication" category, with an estimated severity of Low. Common causes include failed HVAC control module, blown HVAC fuse and loose connector after dashboard work; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Failed HVAC control module
- Blown HVAC fuse
- Loose connector after dashboard work
- Damaged CAN or LIN wiring
Symptoms
- Climate control unresponsive
- A/C not working
- Climate display off
How to diagnose it step by step
- Check the fuse.
- Check the module connector.
- Reset by disconnecting the battery.
- Replace the module if it doesn't communicate.
How to fix it
Check the HVAC module fuse and connector. If the module is locked up, try disconnecting the battery for 10 minutes; if it doesn't recover, replace it.
Estimated repair cost
HVAC module: $200–650.
Frequently asked questions
What does DTC code U0164 mean?
Lost Communication With HVAC Control Module.
Is code U0164 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code U0164?
Yes, as long as you can defog the windshield.
Related codes
U0155 U0151 U0140 U0121 U0101 U0100
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