There was a deal a few years ago where a Jeep with Chrysler uconnect was hacked to show that people could take it over. The control functions of the vehicle and turn on wipers, lock door and other things. With cars now being drive by wire with no throttle cable and even steering be done by wire. Its not too far fetched to think a car could be hacked. In the future with cars like Tesla. When they are fully autonomous. You will be able to have your car take you to work then it can act as an uber during the day making you money. Then come pick you up at a set time. Or you can set who can use the car and it can leave your spot at work if wife pages it and go pick up you wife, or mom and take them where ever then come back and get you. Its not that far off.
As for GPS yes LEO could request a warrant and search your gps history if the device was capable of storing history. With Uconnect and Onstar your are giving up your rights to your info. Same as if you share that info with Apple or Google. If you don't share with them the cell provider still has it. Once again LEO can get a warrant and Cell provider hands over your info. If you have 4g or VoltE it pretty much reports your location and signal strength whenever your phone makes a request. This happens all the time due to apps checking in. Otherwise they can track you simply from your cell or 2g signal. You are continually pinging off of towers so your phone knows what tower to use due to signal strength. As that signal increases or decreases it will move you to different towers with better signal. This allows for mobility. Back in the early days if you moved away from a tower your call dropped. Now they hand off from tower to tower as you move about. All that data is tracked.
As for GPS yes LEO could request a warrant and search your gps history if the device was capable of storing history. With Uconnect and Onstar your are giving up your rights to your info. Same as if you share that info with Apple or Google. If you don't share with them the cell provider still has it. Once again LEO can get a warrant and Cell provider hands over your info. If you have 4g or VoltE it pretty much reports your location and signal strength whenever your phone makes a request. This happens all the time due to apps checking in. Otherwise they can track you simply from your cell or 2g signal. You are continually pinging off of towers so your phone knows what tower to use due to signal strength. As that signal increases or decreases it will move you to different towers with better signal. This allows for mobility. Back in the early days if you moved away from a tower your call dropped. Now they hand off from tower to tower as you move about. All that data is tracked.