Coolant Temperature Control Module Requested MIL Illumination

Where it lives

For P25AF, the part to look at first is the module named here.

Check these first

• A coolant temperature control module that has commanded the lamp on
• An active fault inside the coolant temperature control module
• A corroded or loose supply connector at the control module
• A control module calibration that is out of date

What to do next

1. Read the coolant temperature control module for stored faults
2. Check the control module supply and ground connections
3. Inspect the coolant temperature sensor signal into the module
4. Repair any fault that set the module lamp request
5. Update the coolant temperature control module calibration
6. Clear the code and retest

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