Reductant Control Module Power Relay De-Energized Performance - Too Early

Where it lives

For P20EA, the part to look at first is the relay named here.

Check these first

• A reductant module power relay with sticking contacts
• A fault in the relay control circuit from the module
• A power or ground fault at the reductant control module
• A relay that drops out before the module expects

What to do next

1. Test the reductant power relay for sticking contacts
2. Check the relay control signal from the module
3. Inspect the relay wiring and connector for corrosion
4. Verify module power and ground under load
5. Replace the relay, then re-test before condemning the module
6. Clear the code and retest

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