[mschuster91]

> All you would need to do is sneak into the car and plug in a low profile OBD reader-like device with a cellular modem, and you could send these messages from anywhere.

As the article states, modern cars employ CAN-bus gateways that act as data brokers. The OBD port usually only gets access to the buses that are relevant for emissions certifications and ordinary shop work and that's it.

The movement to separate and gated CAN buses started with people manipulating their engine controllers, initial exploits targeting the radio and then the avalanche of thieves using OBD to disable alarms and reprogram keys.