I'd call Silverleaf and ask. Since it shows unknown it's not an expected trouble code. That said, Silverleaf codes can be parsed by Silverleaf and they may give you some insight. They've helped me out in the recent past. Cummins won't let Silverleaf show the Cummins codes so Silverleaf had to create their own based upon the Cummins codes. Of course, the Cummins diagnostic tool will give you more info and searchable Cummins codes.
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