اتصال کوتاه در یک قطعه ولتاژ بالا

A short inside a high voltage component — motor windings, inverter, cabling or the pack itself. The system monitors insulation resistance continuously, so it detects a path to the vehicle body long before anything external suggests a problem.

The response is to open the contactors and shut down, which is the protection working exactly as designed: the vehicle stops and is safe. Do not attempt to diagnose this without the manufacturer's isolation procedure and the correct equipment. An insulation fault means the high voltage system may not be isolated from surfaces a person can touch, which is the one fault on a vehicle that can be lethal. Moisture ingress is a common cause — a failed seal on a component or connector — and it can be intermittent with weather, which makes it more dangerous rather than less.