Toyota Prius won't fully turn off, false off mode causes beeping and inability to lock on Toyota Prius

Some Toyota Prius owners report experiencing issues where their vehicle won't fully turn off, entering a false off mode that causes beeping and prevents locking. This problem may stem from a malfunctioning power button, the need for a computer system reset, or inadvertently leaving the car in accessory mode. Additionally, factors such as a dead high voltage battery, a dead 12v battery, a weak key fob battery, a clogged fuel filter, or fuel pump failure could contribute to this issue. The combination meter, which displays crucial driving information, is often implicated in preventing the Prius from shutting off completely. In some cases, alternator failure may require replacing the combination meter to resolve the issue. Owners experiencing this problem are advised to hold the power button to turn off the vehicle, check the batteries and fuel systems, and consider using the safety override feature if necessary.