Reductant Control Module Requested MIL Illumination

Where it lives

For P20C9, the part to look at first is the module named here.

Check these first

• A reductant level below the minimum threshold
• Contaminated or diluted reductant in the tank
• A failing reductant control module
• Corrosion or damage in the module wiring or connectors
• A software issue in the reductant control module

What to do next

1. Check the reductant level and refill the tank
2. Inspect the reductant for contamination
3. Check power, ground and connectors at the reductant control module
4. Read reductant control module codes and data with a scan tool
5. Update or replace the reductant control module if it keeps requesting the lamp
6. Clear the code and retest

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