I have a 15 Ram 3500 that did that when it got below -15. It left me stranded in Iowa once and in Wisconsin twice both times on a weekend. I cured it with a EFILive tuner and programming. No problems since and I have over 130K on the clock. It had been to the dealer at least six times to be fixed.
It was 91 degrees yesterday and the truck has 7800 miles on it.
3rd time adding DEF Fluid.
Container of DEF was new and never opened.
This sure does not give me a warm a fuzzy feeling to drive long distances on the weekends now.
