I do this on my cars.
Plug an Xbee3 into your cars usb so it is only powered on when the car is running.
Acts like a Smartthings arrival sensor but with longer range.
This way it only opens your garage if the car is running. Opens the garage as I arrive and also acts as a safety feature so the garage doors open if your car is inside running.
If you just want to know if the car is home you could just throw a Smartthings arrival sensor in the glove box.
But for security I only use the Xbee3 for opening and closing the door since it only works when the car is running.
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