NHTSA Complaint #11414356 — 2020 HYUNDAI SONATA

THE VEHICLE'S FUEL GAUGE (TYPE C) DOES NOT ACCURATELY ADJUST FOR CHANGES IN THE AMOUNT OF GAS IN A TIMELY MANNER. IT NORMALLY TAKES 2-3 DAYS FOR THE GAUGE TO MOVE TO FULL TANK EVEN THOUGH IT IS FULL. SAME PROBLEM FROM 1/4 TO 1/2 TANK, ETC. FOR EXAMPLE, I NOTICED THE PANEL SAID I HAD 11 MILES TO EMPTY ON FRIDAY. THE GAS GAUGE SHOWED OTHERWISE. I WASN'T NEAR MY USUAL FILL STATION, SO I PUT 5 GALLONS OF GAS IN THE CAR. IT IS NOW WEDNESDAY (5 DAYS LATER). THE GAS GAUGE MOVED SLIGHTLY YESTERDAY TO ALMOST 1/4 TANK, BUT THE FUEL TANK WARNING WENT FROM 11 TO 0 MILES LEFT TO EMPTY (SEE ATTACHMENT). I DROVE ON THE HIGHWAY EACH DAY AND IN THE CITY. I PURCHASED THIS CAR JULY 2020 WITH A FULL TANK. THIS PROBLEM BECAME EVIDENT IN AUG 2020. AFTER REFILLING THE TANK, THE READER SHOWED 111 MILES TO EMPTY. I INFORMED HYUNDAI AGENT OF THE ISSUE, WHO HAD NO IDEA WHY THIS WAS HAPPENING. THE GUAGE AND FUEL TANK READER FINALLY ADJUSTED AFTER ABOUT 3 DAYS. I HAD 449 MILES ON THE CAR AT THAT TIME. I NOW HAVE OVER 4,000 WITH SAME PROBLEM. APPARENTLY, SOMETHING IS FAULTY, BUT I DON'T KNOW WHAT. AUTO DEALER IS BAFFLED. THIS ISSUE COULD RESULT IN A REAL FUEL SHORTAGE WHILE TRAVELING WITH NO GAS STATION NEARBY.