Invalid Data Received From Turbocharger/Supercharger Control Module A

Where it lives

For U040D, the description names the module as the part involved.

Check these first

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

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