Running fine then died. Wont start

So was driving fine. Nothing wrong! Had car come up beside me flashing me down. Had white smoke coming from under car. Pulled off interstate came to stop to wait for traffic. Car died and would not start back up. White smoke was coming out of oil cap. Has oil in it reads full on dip stick. Coolant was little low but not bad. Been setting now two weeks. It turns over but won’t fire. Almost sounds like no compression. Hooked code reader up cause now engine light on. Gives me one code P0117 Engine Coolant Temperature sensor. Any ideas on what could be problem? I’m stuck :( Thanks