Have you checked the analyzer menu yet? It should be A2.4.15. That should show you what mode the sideshifter is in. To check the solenoid it should be A3.4.13.
You can also run a test for the sideshifter using A4.4.13. That will require you to be in service menu 3.
It could be an access 4 issue but the analyzer menu should help narrow it down.
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