2015 TOYOTA HIGHLANDER HYBRID Engine Problems

I UNKNOWINGLY FAILED TO TURN OFF MY CAR LAST NIGHT. IT HAS A KEYLESS IGNITION (FOB) AND SETS OFF AN ALARM WHEN LEFT ON. UNFORTUNATELY, LAST NIGHT MY HUSBAND ARRIVED HOME AT THE SAME TIME AND BETWEEN 2 GARAGE DOORS CLOSING AND EXCITED, BARKING DOGS I DIDN'T HEAR THE ALARM. WE WENT TO BED SHORTLY THEREAFTER. MY HUSBAND WOKE UP VERY EARLY AND HEARD OUR CARBON MONOXIDE DETECTOR GOING OFF IN THE GARAGE. WHEN HE OPENED THE DOOR HE DISCOVERED IT WAS VERY HOT AND THE DETECTOR WAS REGISTERING HIGH LEVELS OF CM. HE OPENED THE GARAGE DOORS AND WINDOWS IN THE HOUSE. I HAVE SINCE RESEARCHED THIS. SEVERAL PEOPLE HAVE DIED UNDER THE SAME CIRCUMSTANCES. I FEEL LUCKY. THE CAR IS A HYBRID SO IT WAS ALTERNATING ALL NIGHT BETWEEN THE ENGINE AND THE BATTERY. WE ALSO HAD A CM DETECTOR IN THE GARAGE WHICH IS NOT LEGALLY REQUIRED....