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This is the easiest problem in the world to fix going forward... The entertainment system (usually the entry point for this kind of stuff) has no business being connected to any core systems (steering, throttle, brakes, ignition). Just keep the core systems separate, without any connectivity to ANYTHING that can be accessed remotely.

Boom. problem solved.

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I had this same thought but someone in another hn thread had a good point about how a lot of features still use the core systems. Remote starting your car (a common aftermarket feature for the last 20 years) from an app now obviously needs access to the engine. Even if you disconnect the "core systems" they're still probably going to be connected to the internet.

Except the cars are not wired that way, and design changes are expensive once cars are in production (kind of like software in that way, only moreso because they are physical things).

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