Invalid Data Received From HVAC Control Module

Where it lives

For U0424, the part to look at first is the module named here.

Check these first

• An open or short in the HVAC Control Module wiring
• A broken or chafed HVAC Control Module wire
• A calibration fault in the HVAC Control Module

What to do next

1. Scan every module and record the stored codes
2. Verify power and ground at the HVAC Control Module
3. Replace the HVAC Control Module if the circuit and grounds test good
4. Clear the code and retest

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