This has happened in the past during the soft regen, but once again it is here. If the truck is at idle you start to smell exhaust/fuel in the cab. If you change to recirculate from fresh air, you don't get the smell. But it is definitely there in fresh air mode. I would take it to the dealership, but I need it for a trip this weekend and who knows how long they will need it to figure out what the problem is.