Invalid Data Received From Auxiliary Heater Control Module

Where it lives

For U0425, the description names the module as the part involved.

Check these first

• An interrupted ground to the Auxiliary Heater Control Module
• A broken or chafed Auxiliary Heater Control Module wire
• Water intrusion or heat damage at the Auxiliary Heater Control Module
• A corroded or damaged Auxiliary Heater Control Module connector

What to do next

1. Read the stored codes on a scan tool
2. Check the Auxiliary Heater Control Module connector for water, corrosion, or loose pins
3. Verify power and ground at the Auxiliary Heater Control Module
4. Replace the Auxiliary Heater Control Module if the wiring and voltage tests pass
5. Clear the code and retest

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