I work with heavy vehicle measurements on a chassis dynamometer. Quite often we are accessing the vehicles’ CAN bus. We don’t want to mess with them but we just want to know certain values and CAN bus is useful for that purpose.
But we have noticed that nearly all modern heavy vehicles have some kind retrofitted communication device(s) attached to vehicle’s CAN busses (there are several of these but some use protocols that are unknown to us). Sometimes there are several of these communication boxes too. We don’t know what they are doing and sometimes even the owners of the vehicle don’t have any idea if there are those.
Most of these are some kind of fleet managements system or related to the ticketing systems (in city busses). But my point was that there are already remote access links in many vehicles. Accessing or misusing those might be difficult but it still could be possible.
