Invalid Data Received From Glow Plug Control Module 1

Where it lives

For U0407, the part to look at first is the module named here.

Check these first

• The Glow Plug Control Module 1 sending data the ECM rejects as invalid
• A wiring or connector fault between the Glow Plug Control Module 1 and the ECM
• Low voltage that corrupts the Glow Plug Control Module 1 messages
• Software in the Glow Plug Control Module 1 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 Glow Plug Control Module 1 code
2. Check the Glow Plug Control Module 1 connector pins for corrosion or a poor fit
3. Test the wiring between the Glow Plug Control Module 1 and the ECM
4. Check battery voltage and charging under load
5. Replace the Glow Plug Control Module 1 if the data stays invalid
6. Clear the code and retest

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