动力电池还有电，车却无法进入 READY？把低压供电和高压问题分开说

Traction-battery charge does not establish that every vehicle power system is healthy. A low-voltage issue can affect wake-up or READY, but other faults may produce similar symptoms. Record the first dashboard messages, response sequence, parking history and recent work. Ask for vehicle-specific tests rather than a universal voltage cutoff or automatic battery replacement. Do not touch high-voltage components or copy a combustion vehicle's jump-start procedure. Identify the exact vehicle to recovery staff and use its transport requirements. Collision, flooding, smoke or abnormal heat changes the safety situation: keep clear and contact appropriate emergency assistance rather than inspecting the battery yourself.