Did you have any issue in that cold of weather with the Diesel not getting up to temperature? Did you consider a radiator soft cover?12,500 miles with the DEF software screwing with my world 1 time, flashed firmware on National recall Y-81 I believe and all good since.
Also had the issue with the auto start/stop battery not charging correctly, but that is not a diesel specific issue.
Live in ND and it started life with 20+ days of 100* F or higher last summer and into-40*F without windchill over the winter. For all intents and purposes been solid vehicle.
Would have ZERO hesitation in recommending it to any Jeep owner regardless of model. Smooth torque and sweet shifting auto tranny is awesom