The vehicle lights up a red wrench with a lightning bolt through it and then alerts to a ‘service hybrid electric vehicle system’ message. This light stays on from either a few seconds to several minuets before turning off. There is no consistency as to when the warning illuminates. Every time it has come on has been at highway speeds. There is fear that the vehicle is going to lose power and/or propulsion while at a high speed. This feels like a danger to myself, my occupants, and others on the road.