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So quick update, took my truck to the dealer today, scanned no codes, flashed and derate message is now gone, everything seems to be fine. So apparently once you're at that point only a dealer can save you. I will update more if anything pops up again. Thanks to everyone for all the responses...
So I live in Montana and have the dreaded Service DEF System see dealer, now down to 51 miles. Originally it through code P203E, reductant level sensor I parked it in the garage cleared code, added DEF and have drove about 40 miles. No codes now but still have see dealer message. The gauge has...