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DM N/59 will not give any codes nor can it be Initiated after clearing until the systems has done all emmisions related self-test. That brings it back to mean. This requires drive cycles until ALL DM emmssions Self Test have been done.
N/59 module codes are Emmissions Related ONLY codes. This is the ONLY module that can not be reset until self-test are completed by design in order that one can not clear a CE lamp or erase impending emmissions codes when going for DOT Mandate testing.
All other modules can be cleared back to Single Flash/No Code status for diagnostics at will.

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A Dalton