Originally Posted by RDinNHandAZ
Without the codes I am guessing and even with them I would be but it would be a better guess. Those symptoms have been posted up here and the eventual fix (IIRC) was a bunch of new wiring due to DEF corroding the wiring harness near the DEF injector. Bad/impure DEF could cause this or a contaminant in the tank. I am assuming the following: you have the most recent ECU update, the DEF has been topped up from a good source (some reports that “BlueDEF” has shown problems, but I doubt it), OR the DEF tank has been cleaned and refilled and the codes reset after a test run. I can’t recall these codes being fixed by replacing other parts although a few ‘14s got new DEF injector/pump. Certainly the catalytic converter would not be suspect from what you say, but without the codes??????
Thanks RDinNHandAZ for the suggestions. I asked the dealer for the codes and they said they'd send them over, but have not gotten back to me yet. I'll post here when they do.
For the third or fourth time they've called and told me it *might* be ready by end of day, and yet again I've gotten no response from them. Once I get those codes I'm going to take them to the dealer I purchased it from and see if they can help in the process or compensate me in some way.