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Code

U0164

Network

Lost communication with HVAC control module

Communication with the climate control module is lost.

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Most likely causes

HVAC module fault
CAN wiring fault
Low voltage

Symptoms you may notice

Climate control unresponsive
Fan/AC faults

Checks to run

Check HVAC module power
Test CAN wiring
Scan the HVAC module

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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