Hey TNTErick,
Sorry if the car disappeared somehow. I put the car position in the save file so wherever the car is its actually saved there unfortunately. I'll add a reset car position cheat soon so you can try and salvage your save file. Once the DLC store is in the game you'll be able to summon any of the cars you have when something like this were to happen. Hopefully the problem is not with the map not showing where it is.
Thanks for the feedback,
Rafi