以prius 2而言, 當OEM HV battery 出現異常或故障, 儀表會出現紅色三角警告訊號, 此時 HV battery system shut down, 車子純以引擎做動力, 油耗與一般車相同 車子不會行進中拋錨或無法啟動 這在國外PHEV user 網站有不少例子 謹摘錄一段 Red triangle at 55 mph by GeneralAnarchy : ...I left my garage today after charging a while, got up to 55 and switched on the kit. Then 4 minutes after switching on the kit I got red triangle just driving steady at 55mph. At that time the engine RPM jumped to about 3800 ...