Lost Communication With HVAC Control Module - Rear

Where it lives

For U0165, the part to look at first is the module named here.

Check these first

• A failed rear HVAC control module
• Damage on the rear HVAC module harness
• Water or corrosion at the rear HVAC module
• The rear HVAC module installed wrong
• A software or firmware fault in the computer

What to do next

1. Check power and ground at the rear HVAC control module
2. Inspect the rear HVAC module harness and connector
3. Look for water damage at the rear module
4. Verify the rear HVAC module is installed correctly
5. Update the computer software or firmware
6. Clear the code and retest

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