Modern cars, I think because of safety laws and “trade secrets”, can be quite a pain the reverse engineer. It’s notoriously difficult to even interface with any of the chips in any of the onboard computers in the first place, let alone reverse engineer what’s going on and modify it. On top of that some car companies, like Toyota, are starting to add HMACs to all the messages they send on the CAN bus, so even if you did figure out everything, unless you get the signing keys every message will be ignored. On top of that, it’ll void your warrant, which I know some people don’t care about, but for a new car that you are having to depend on, its another hurdle.
Modern cars, I think because of safety laws and “trade secrets”, can be quite a pain the reverse engineer. It’s notoriously difficult to even interface with any of the chips in any of the onboard computers in the first place, let alone reverse engineer what’s going on and modify it. On top of that some car companies, like Toyota, are starting to add HMACs to all the messages they send on the CAN bus, so even if you did figure out everything, unless you get the signing keys every message will be ignored. On top of that, it’ll void your warrant, which I know some people don’t care about, but for a new car that you are having to depend on, its another hurdle.