Control Module Internal Temperature A Too High

Where it lives

For P0634, the description names the module as the part involved.

Check these first

• An internal control module temperature sensor that reads high
• A module running hot from a nearby heat source
• A restricted airflow around the module
• A poor module ground
• A failed control module

What to do next

1. Check the module mounting and airflow
2. Look for a heat source near the module
3. Check the module ground and power feed
4. Read the internal temperature on a scan tool
5. Replace the control module if it reads high when cool
6. Clear the code and retest

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