Let me start by saying I’m not an expert on the specifics of your vehicle. But Your HV was most likely not engaged. EVs default in a state of HV open circuit (contactors open) and it’s extremely difficult to force it to close the circuit with all of the software safeguards in place. It seems like there’s something wrong on your 12v system which is sending error messages preventing the car from starting. That being said, it’s extremely foolish to jump an EV 12v battery rather than replace it. it’s function is akin to a backup battery in a PC or those old school calculators with a AA plus coin battery, you know? If it were dying, you’d probably notice behavior earlier. They aren’t used to start cars any more, but to keep them alive.
Anyway, take it to an expert. Not a general tech or roadside service. Either the OEM service center or somebody with proven success on your vehicle. EVs are not yet at a place where the common Joe schmo can try to service themselves. This is proven by your experience and the lack of understanding in the tech. Good luck!
Let me start by saying I’m not an expert on the specifics of your vehicle. But Your HV was most likely not engaged. EVs default in a state of HV open circuit (contactors open) and it’s extremely difficult to force it to close the circuit with all of the software safeguards in place. It seems like there’s something wrong on your 12v system which is sending error messages preventing the car from starting. That being said, it’s extremely foolish to jump an EV 12v battery rather than replace it. it’s function is akin to a backup battery in a PC or those old school calculators with a AA plus coin battery, you know? If it were dying, you’d probably notice behavior earlier. They aren’t used to start cars any more, but to keep them alive. Anyway, take it to an expert. Not a general tech or roadside service. Either the OEM service center or somebody with proven success on your vehicle. EVs are not yet at a place where the common Joe schmo can try to service themselves. This is proven by your experience and the lack of understanding in the tech. Good luck!