One of failures that can disable drivability is some failure modes from the DCDC HV clients (AC comp, coolant heater, cabin heater) These failures don't have much to do with drivability other than coolant heater to enable faster driving+charging. Tesla is being ultra safety conservative @ the cost of stranding the driver. Its a shame these can leave you stranded say on a long road trip.
Just guessing but some possible failure modes that can disable HV (and therefore drivability) include
If works, then can remove passenger front tire+liner, disconnect HV+12v, plugin dummy/jumper and regain drivability. Sightly more effort than fixing a flat but much better than hassling with long distance flat bed tow and wait for repair.
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Of course there is still all the HVIL switches everywhere that can fail and leave you stranded... yet another topic haha
Just guessing but some possible failure modes that can disable HV (and therefore drivability) include
- Short between HV +- (although resistive heaters are nearly a short already. Coolant heater measures 30+ ohms)
- higher resistance build-up on the connector (behind possibly damp carpeted passenger front wheelwell on gen1 DCDC) causing battery precharge contactor sequence to fail.
If works, then can remove passenger front tire+liner, disconnect HV+12v, plugin dummy/jumper and regain drivability. Sightly more effort than fixing a flat but much better than hassling with long distance flat bed tow and wait for repair.
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Of course there is still all the HVIL switches everywhere that can fail and leave you stranded... yet another topic haha
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