Invalid Data Received From Reductant Control Module

Where it lives

For U040F, the description names the module as the part involved.

Check these first

• The Reductant Control Module sending data the ECM rejects as invalid
• A wiring or connector fault between the Reductant Control Module and the ECM
• Low voltage that corrupts the Reductant Control Module messages
• Software in the Reductant Control Module that is out of step with the ECM

What to do next

1. Read stored codes on every module and note codes paired with the Reductant Control Module code
2. Check the Reductant Control Module connector pins for corrosion or a poor fit
3. Test the wiring between the Reductant Control Module and the ECM
4. Check battery voltage and charging under load
5. Replace the Reductant Control Module if the data stays invalid
6. Clear the code and retest

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