Lost Communication With HVAC Control Module

Where it lives

For U0164, the part to look at first is the module named here.

Check these first

• A failed HVAC control module
• Corrosion or damage on the HVAC module harness
• A fault in the computer that talks to the HVAC module
• Software that stopped matching the HVAC module
• Water intrusion at the HVAC module

What to do next

1. Check power and ground at the HVAC control module
2. Inspect the HVAC module harness and connector
3. Check the computer for faults on the HVAC network
4. Update the software so it matches the HVAC module
5. Replace the HVAC control module if it does not answer
6. Clear the code and retest

Look up another code