TL*THE CONTACT OWNS A 2008 HYUNDAI SONATA. WHILE DRIVING FOR APPROXIMATELY THREE HOURS, THE CONTACT NOTICED THAT THE TRUNK AJAR WARNING LIGHT WAS ILLUMINATED ON THE INSTRUMENT PANEL. ANOTHER MOTORIST ALERTED HIM THAT THE REAR OF HIS VEHICLE WAS ON FIRE. THE CONTACT PULLED OVER AND NOTICED THAT THE WIRES IN THE TRUNK WERE ON FIRE. HE WAS ABLE TO SAFELY EXTINGUISH THE FLAMES AND RESUME DRIVING. WHILE DRIVING 40 MPH IN THIRD GEAR, THE VEHICLE UNEXPECTEDLY DOWNSHIFTED TO FIRST GEAR. IN ADDITION, THE ENGINE WARNING LIGHT ILLUMINATED ON THE INSTRUMENT PANEL. HE IS IN THE PROCESS OF HAVING THE VEHICLE INSPECTED TO DETERMINE THE CAUSE OF THE FAILURES. THE FAILURE AND CURRENT MILEAGES WERE 43,000.