A vehicle includes a traction battery; a bus; a main contactor between the traction battery and bus; a precharge contactor between the traction battery and bus in parallel with the main contactor; and a controller configured to, responsive to a first precharge mode signal, command a charging station to increase a voltage on the bus and subsequently close the precharge contactor before closing the main contactor, and responsive to a second precharge mode signal, close the precharge contactor without first commanding the charging station to increase the voltage on the bus before closing the main contactor.