What 274 owners told NHTSA about the 2018 Hyundai Elantra

My daughter was in a parking lot and put her car in park, removed her keys and exited the vehicle. She walked around the vehicle and was removing her school bag and the car came out of park and rolled into another vehicle.

NHTSA ODI 11743413

Initial Fault Code: P0303 Replaced all 4 spark plugs and all 4 ignition coils. The check engine light extinguished momentarily but returned, logging P0303 and a new P0301 Replaced all 4 fuel injectors. CEL extinguished momentarily and then returned, logging P0303. Replaced the entire engine electrical harness. Concurrently, all related electrical components and connectors were meticulously cleaned with professional contact cleaner. CEL extinguished for significantly longer period of time, and then returned, re-logging P0303 and P0301. Thid suggested the ECU was "handshaking" with new components but re-logging the fault upon detecting the persistent core issue. A full compression test was performed. All cylinders reported results within specification. Using a borescope I inspected cylinder walls in piston tops. There was significant carbon residue buildup but nothing out of the ordinary for similar GDI engines. I still performed a PEA GDI specific chemical cleaning. It was a a little smoother afterwards, but the misfire persisted and CEL remained on. I also removed, cleaned, and tested common sensor faults, with no result. Also p0128 code and no start / electrical drain, and engine light started flashing numerous occasions had to stop the vehicle. I tried swapping the coils, but all that proved was that the coil was good, I did a power and ground test, it passed the connector had 12 plus volt power and a perfect resistance to static ground. The signal wire from the coil connector had perfect continuity to the ECU but had OL to chassis ground showing there was no short. A test light was used to see if anything was coming from the signal wire to the ignition coil and that test failed, there was no signal pulse. The diagnostic process has definitively proven a component-level failure inside the engine control unit. See attached file for more detailed information.

NHTSA ODI 11699689

The contact owns a 2018 Hyundai Elantra. The contact stated that while driving at 70 MPH, the vehicle made an abnormally loud popping sound. Two other drivers alerted the contact that flames were coming from underneath the vehicle. The contact checked the rearview mirror and noticed smoke coming from the vehicle's rear end. The steering wheel then seized, and the vehicle lost motive power. The check engine and several other unknown warning lights were illuminated. The contact pulled over to the side of the road and exited the vehicle. No injuries were sustained, and no medical attention was received. The flames extinguished themselves. There were no police or fire department reports filed. The vehicle was towed to the dealer, where it was diagnosed with a seized crankshaft and determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 224,809.

NHTSA ODI 11582547

WHILE DRIVING, HEARD A LOUD POP THEN SMOKE CAME FROM THE ENGINE. THE ELECTRICAL SYSTEM FLASHED THEN WENT OUT. A PASSER BY COMING FROM THE OPPOSITE DIRECTION STOPPED AND TOLD ME THAT MY CAR WAS ON FIRE. I GOT OUT AND THERE WAS A SMALL FIRE ON THE GROUNG UNDERNEITH MY CAR. THEN OPENED THE HOOD WHERE THERE WAS A SMALL FIRE BEHIND THE ENGINE. ANOTHER TRUCK PASSING BY HAD A FIRE ESTINGUISHER AND PUT THE FIRE OUT. THERE WAS OIL ALL OVER THE ROAD. CALLED A WRECKER SERVICE TO COME AND PICK IT UP. UPON DELIVERY OF MY VEHICLE, THERE WAS OIL ALL OVER THE WRECKER. I'M VERY LUCKY TO HAVE HAD SOMEONE COME BY TO PUT THE FIRE OUT. I COULD OF BEEN IN THE CAR AND BEEN BURNED. THE INSURANCE COMPANY HAS BEEN OUT AND DONE A FULL REPORT ON IT. THERE WERE NO WARNING LIGHT THAT CAME ON DETECTING ANY ISSUES.

NHTSA ODI 11547127

The contact owns a 2018 Hyundai Elantra. The contact stated while driving 35 mph, when the vehicle stalled. The contact stated the oil and the low tire warning lights were illuminated. The contact was able to restart the ignition and drive to an independent mechanic and had oil maintenance completed. The contact stated on 10/31/2021 while driving 35 mph, she started to smell smoke and saw smoke exiting the hood of the vehicle. The contact stated the oil, the low tire, and the check engine warning lights were illuminated. The contact was able to park the vehicle near a parking lot. The contact stated her boyfriend was able to extinguish the fire with a fire extinguisher from a near restaurant, but the fire continue to expand. The fire department was able to extinguish the rest of the fire. A fire report was filed. The contact stated no one was injured nor seek medical attention. The vehicle was not drivable. The vehicle was towed to a towing lot. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 77,000.

NHTSA ODI 11436605

About month ago Sept the car would shut off when driving or stopping and find out it oil I had changed at the tire shop it was changed 2 n half months before that once oil changed running good low tire light ,oil light flash off and on at time well as of 10/12/2021 started do it my again so I check oil there no oil werid where oil go no leak on ground when I leave wherever I parked well went to Walmart get oil put oil in it and started driving not even more 35 miles bout sudden smoke coming from under engine then smell fire I pull over in parking lot at restaurant ran put fire out and it got worse trying grab my stuff and bf with me fire went inside car and under the car hear siren firemen coming if they hadn't gotten there when they did it almost went to the gas tank could of exploded firemen said look like electrical cause fire . Engine light ,oil and tire light were on now undrivable .

NHTSA ODI 11436659

ON JUNE 29,2020 MY 2018 HYUNDAI ELANTRA WITH ONLY 40,000 HAD A ENGINE FIRE AND TOTALED MY ENTIRE CAR THAT WAS PARKED AND TURNED OFF INSIDE OF MY GARAGE

NHTSA ODI 11339703

THE ENGINE SEIZED WHILE I WAS DRIVING ON THE ROAD AND IT STARTED SMOKING. THE CAR JUST STOPPED AND THE ENGINE COULD NOT BE STARTED AGAIN. THE CAR DID NOT WARNING OF OVER HEATING OR OF THE CAR NEEDING TO BE SERVICED. I BROUGHT THE CAR USED AND IT WAS TWO MONTHS AFTER I MADE THE PURCHASE THAT THIS HAPPENED.

NHTSA ODI 11339427

GOT INTO AN ACCIDENT BUT THERE WAS IMMEDIATELY AN ENGINE FIRE

NHTSA ODI 11299711