Nonda ODB2 with 2001 Chevy Duramax

Has anyone else tried the currently free OBD2 with a Duramax engine? I have tried it with an '04 Civic and an '05 Passot and it worked great. But when I plug it into my '01 Silverado 2500HD Duramax it shows me nothing on the dashboard. It only lets me run an engine scan. Anyone run into this or have more details about this? Thanks!

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