Rather than go into the full cyberwar scenario, there are less sinister usages of this: rival companies hiring hackers to meddle with the competitor’s trucks, to cause phantom breakdowns, have trucks behave irregularly, have to be taken out of service because they (hopefully almost) caused an accident, and stuff like that. There, it doesn’t take much to imagine social engineering giving access to the OBD port, or making the infotainment system freak out and distract the driver, or rob him of sleep, things like that.
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