NHTSA Complaint #11142778 — 2017 HYUNDAI ELANTRA

DROVE CAR LESS THAN 20 MILES ROUND TRIP ON CITY STREETS, FOR A MORNING APPOINTMENT. WAS PARKED ABOUT 40 MINUTES DURING THE APPOINTMENT. RETURNED HOME AND PARKED, NO PROBLEM, NO TIRE PRESSURE PROBLEM INDICATED BY SENSORS. DEPARTED ON SECOND TRIP OF THE DAY LESS THAN 6 MILES FROM HOME FOR ANOTHER APPOINTMENT, PARKED FOR ABOUT 50 MINUTES. TIRE WAS COMPLETELY FLAT IN PARKING LOT AFTERWARDS. TOW OPERATOR PLACED MY SPARE TIRE ON, WE VISUALLY INSPECTED THE FALT TIRE AND THERE WAS NO VISIBLE DAMAGE TO TIRE OR RIM. I DROVE VEHICLE TO NEAREST HYUNDAI DEALER 3.5 MILES AWAY. DEALER SERVICE DEPARTMENT INSPECTED TIRE AND RIM WITH ME AGAIN, SAME CONCLUSION NO VISIBLE AND NO APPARENT DAMAGE. SERVICE DEPARTMENT DUNK TESTED THE TIRE, NO LEAK DETECTED. TIRE WAS RE-INFLATED AND PLACED BACK ON THE CAR. DROVE 2 MILES TO HOME AND PARKED. LESS THAN 2 HOUR LATER TIRE WAS COMPLETELY FLAT AGAIN. TIRE IS ON DRIVER (LEFT) SIDE REAR. VALVE STEM IS SNUG, NO APPARENT PROBLEM EXCEPT THAT TIRE NO LONGER REMAIN INFLATED. TIRE AND WHEEL RIM ARE DEALER/MANUFACTURER ORIGINAL EQUIPMENT. TIRE IS BRANDED AS NEXEN NPRIZ AH8, SIZE IS 205/55R16 91H