I deleted CarPlay from my phone. How do I get it back?

ok as I sed theirs no app you connect your iPhone to your car via lightning cable or bluetooth here are the available models :https://www.apple.com/ios/carplay/available-models/ check that just in case

and here is how to connect you iPhone to your car: https://support.apple.com/en-us/HT203412

I don't know what you mean buy that theres no app for CarPlay you either connect your iPhone to your car via cable or bluetooth do you mean that while using it the app stoped working ?