sounds like a temp issue then, mine said the same thing the other night, it was warm outside.
I did some digging around, if you have your heater on to blow warm air when cold, heated seats on and heated steering wheel, if the outside temp is warm the truck will not autostart. Just the same in eht Summer of the truck is set to A/C and seats are on, and the temp is cool the truck will not start either.
did you hit the remote start again? if you get 1 horn honk, then the truck will not start on remote start.
Dodge did this to prevent issues and catostrohic failures and burn downs.
try this - turn the inside heater fan speed to off, and then retry the remote starter.