Comment by maxerickson

You basically get internal faults and cable faults with HV stuff. A box reporting that the AC compressor motor winding isn't shorted isn't going to make the compressor work with a shorted winding. ECU probably wouldn't disengage the powertrain for that though.

And then things like battery temperature warnings will quickly turn into real failures.

And then the next generation or 2 of stuff is going to at least attempt to implement cybersecurity features that greatly complicate tampering at the message level.