Discussed on Hacker News here: https://news.ycombinator.com/item?id=33255920 and more recently: https://news.ycombinator.com/item?id=41496725
Doing it to your own car is obviously very different from stealing someone else’s, however it’s not illegal to “hack” your own car. The theft part is what gets you in trouble.
I'm certain some car company will sue you if they get to know that you did.
I've always known hacking as a term specifically related to bypassing security in digital systems. Think Matthew Broderick gaining access to government networks via a phone line. This was hacking that would always get you in trouble if caught.
I'm not quite sure when "hacking" was repurposed as a term for using something in a way it wasn't intended ("life hacks" or "kitchen hacks", etc).
Now hacking is about challenging social norms? I'm very lost at this point, in an "old man shakes fist at clouds" kind of way.