2015 Ecodiesel Ram here, not a ton of problems but recently the following were replaced under warranty.
Reluctor wheel
High pressure injection pump
6 injectors
DPF
I did have to pay $143 for a fuel filter
Mopar paid the dealer just short of 10k for the repairs.
This truck would have been sold a long time ago if I did not receive an extended warranty as a result of the emissions recall.