I added this to my wife's 2014 Caravan.
https://www.amazon.com/Fortin-EVO-CHRT4-Stand-Alone-Chrysler-Vehicles/dp/B00BMWQ7RU
I hit the lock button 3 times and it starts. Will run for 15 minutes, which is adjustable. You will need to buy the FlashLink thing to program it, but I have it and you're welcome to swing by and grab it if you want to save the $30-$40.
Install seems overwhelming, but it's actually simple.
