Mine did the same thing. In tank heater for def tank has gone bad. Whole tank has to be replaced.
2014 GC New DEF problem
More def problems. At 47K miles I got the MIL light. The code was P20BD which is: Reductant Heater B Control Circuit/Open. The Jeep still runs but starts to run a little rough at low idle after a couple hundred miles. Apparently this a sensor within the def tank and sensor is not a simply plug-n-play but requires this part to be replaced.
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