2023 Hyundai Sonata

I bought the new car on 11/21/22. There have been two incidents with the same cause. Incident #1: On 1/25/23, while I was on a six lane highway with high speed traffic and rush hour level traffic, the car began to fail, with 'bucking', failure to respond to the gas pedal, loss of power, and difficulty steering. At that time, the check engine light also went on (it had not been on previous to the event starting). I was able to get the car off the highway, where it completely died - it would not move. It was towed. Mileage at this time was 1,330 miles - the car was 2 months old. It was diagnosed that "Cylinder #3 fuel injector is stuck open causing drivability issue". The likelihood that I would have been hit, by another car on that multi-lane highway with cars at high speed, and hurt or even killed is extremely high, if not certain. I did not file a report with NHTSA about the first incident (I was not aware of this service.) Incident #2: On 12/7/24, while I was again on a six lane highway, high speed traffic, night darkness, rain, and rush hour level traffic, the car began to fail in the exact same way as in 2023, 'bucking', failure to respond to gas pedal, slowing, difficulty steering, etc. I was able to get off the highway before it completely 'died'. It was undriveable and had to be towed. There was no warning light prior to the event occurring. Mileage at the time was 21,091. The probability, considering the rain, the dark, and the fact that I was on a 'super highway', that I could have been hit, hurt or even killed is extremely high. The diagnosis was 'TSB indicated #3 Fuel Injector be replaced." I do not have any of the old fuel injectors. In addition, I routinely - multiple times a week - have small children in this car. These events could have happened when I had a carful of small children with me. My routine schedule means there was also the high probability of others being hurt.

While driving on the country side, my car engine stopped providing power to the car and started making some noise. The engine rpm would fluctuate and increase due to downshifting but there was no power. Luckily, the car had some speed around 50 mph, the road was slightly downhill and nobody was behind, managed to coast to a gas station half a mile away. The engine shut itself off after the car stopped. I was able to restart the car but it would shut itself off within 2 seconds of restart. Car was towed to the dealership and I was told that it had a faulty injector. The injector was replaced a week later and I received my car back later.

My name is [XXX] , and I am the frustrated owner of a 2023 Hyundai Sonata SEL. For context, I am a [XXX] woman who had never experienced the frightening event of a “brand new” car breaking down—until now. I am still in shock and trembling from the experience I had with my “new” 2023 Hyundai Sonata on the morning of [XXX]. At 9:30 a.m., I was driving on [XXX] . I was driving the speed limit (55 mph) and cruising along when, all of a sudden, as I went to accelerate, my vehicle instead began decelerating rapidly. I pressed the gas pedal, thinking I might have let up too much or accidentally had my foot on the brake. However, pressing the gas only caused the RPM to spike, with no change in my speed. I had to act quickly, paying close attention to the surrounding traffic as my car slowed down. Thankfully, I managed to maneuver from the far-left lane to the shoulder of the highway. My speed had dropped to around 30 mph and was decreasing. Trying to safely navigate a slowing vehicle on a highway filled with traffic is an adrenaline rush I wouldn’t wish on anyone. I was in a state of severe panic. As I steered the car onto the shoulder, I noticed it was shaking and struggling to move forward. White smoke was also coming from the exhaust. Once safely stopped, I put the car in park and turned off the engine to let it cool down. After a few minutes, I restarted it and noticed the engine, oil, and battery indicators were all illuminated on the dashboard. My first thought was a battery issue, but the car was still able to turn on. However, the engine did not start. A notification appeared, stating the car was not in a condition to be driven. After receiving the car back from the Hyundai Dealer I was notified that the issue was due to fuel injectors failing. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On 3 separate occasions the vehicle decelerated, lights flickered and stated to produce a burning smell through the engine. Each time the car would not allow me to accelerate and eventually stalled out. The car would no immediately start. After a few minutes it would start but not accelerate. After about 30 minutes it would start and would drive about 5-15 mph, enough to get me to my location. On the first occasion I was coming home late in the evening after working a 12 hour shift and had to have a family member get me after being stranded by the side of the road. The second time I was taking my 4 to son to his planned surgery in a bigger city and it broke down on the way. It was not safe driving in the city barely being able to excel but we did it for my son. The third time I was in a larger time in traffic and missed an appointment as I tried to stear my decelerating vehicle out of multiple lanes of traffic to a safe location. I could not use the air conditioner while I attempted to let it rest in 100°+ heat. Each time the lights would flicker and dim. There would be a smoke from the exhaust. After the first 2 occurrences we took it to the dealership but they were not able to replicate the problem or identify a causative code. During the last occurrence we were able to get it to the dealership very slowly and they deemed it to be the fuel injector malfunctioning. This was fixed after about a week or so of being in the shop . About a week or two after the fuel injector was fixed the check engine light came on. We took it back into the service department and they "reset" the system thinking it was an error. The light came back on in less than 24 hours. The vehicle has been running a little harder, not as fast or responsive as normal. A service/evaluation date was scheduled and the code was checked indicating it was likely the catalytic converter. We scheduled another service appointment once the part was in which is 2 weeks from the evaluation appointment.

Hello, I have Hyundai Sonata 2023. The fuel tank of this car is expanded on [XXX]. I have never heard about this issue to any cars. I took my car to dealership they said they don’t know why this happened and they said they cannot fix it, my car at the dealership more than a month. I have created a case with Hyundai corporate office in CA, it’s been a month since this case was created and I could reach out to my case manager only twice for this period of time. They are keep saying they are working on it, but no results they don’t even look at my car. Today I barely could reach my case manager and she told me that this is not under warranty and I will need to fix it out of my pocket. When I bring the car to the dealership they told me this not under warranty since warranty was up to 60k miles, I have 90k I asked them to fix it and I will pay but they said they don’t know how to fix it. Today I have researched and found that this issue is really common among Kia K5 and Hyundai Sonata’s 2021 2024, I will provide a link here: [XXX] Please check this link and you can see that most of the cars fuel tanks are expanded and back seats popped up. I have same exact problem. Kia asked drivers to inspect the cars with this issue and they said they will fix it for free since this is fuel tank defect. But what should I do with my Hyundai Sonata. I have same exact issue as you see at the link I have provided. I had powertrain DTC PO451 since march of this year dealership said just check if gas cap is on properly, but this caused this issue I see Hyundai will not help me it will almost 2 month I don’t have my car and I am still paying for it, please let me know what I can do Thank you! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On two separate occasions, one at @9500 miles and the next at @19,000 miles the car engine started shaking and lost all power while driving. Unable to steer car. Both times towed to dealer and they say it needs new spark plugs and need to clean cylinders. They do not know root cause of problem and have not done any testing of the engine, no leak/compression testing. Dealer refuses to cover cost of repairs saying out of warranty but cannot give any assurances this won’t happen again. I’ve requested they contact Hyundai engineers to find out what’s causing this and, to date, they’ve done nothing. Vehicle is unsafe to drive and is still at dealership with no reason to underlying issue.

The car would not accelerate, nor switch gear while I'm driving middle of the highway. The car engine started to shake after my car wouldn't switch gear. The car engine would not start after turning the car off and caused a engine misfire. The transmission gear has a hard time switching gear from 0-40mph. This same incident occurred twice since purchasing the car in late November 2022.

Had been traveling for approximately 2.5 hours in a winter storm, pushed on brake to slow down and park and the car started to chug. Turned car off and then back on again. Car would not start and had to be towed to nearest Hyundai dealership. There were no warning signs at all, car just suddenly quit. We were later informed that it was the fuel injectors. We were very fortunate that this did not occur in a place with no cell service on a very frigid, stormy night.

Driving going 30 mph, vehicle stopped accelerating. Error code was Engine Control System failure. Codes P2178, P0301 and P0087F0 were shown at dealership. Car was taken to dealership for repairs where the fuel injector on cylinder #1. 16 days after receiving car back, we went to start the car and it wouldn't start. After several attempts, gasoline began spewing from the car leaking an entire tank of gas on our garage floor and driveway. Very dangerous! Being towed to dealership again today.