I was on my way back home from Alexandria LA on [XXX] when I heard like the sound of an blow out tire but wasn-??t happen to look in back of car and seen back seat was blown off the area of the car and proceeded to see that the gas tank was expanded like you would see a balloon and the me car started running funny and. Then a service code comes across the screen of the radio po45100, so I pull over and look beneath the car and see that the gas tank is so expanded it-??s now pressing against the exhaust pipe. So I turned car off and here we are now I-??m without a car due to this. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Anacoco, LA, USA

Vechile shut down completely on the highway, engine's been replaced twice, Catalytic converter, Turbo was replaced three times, Battery oxygen sensors, timing belt all have been replaced, Along with my wireless charger and Both heaterhouses and splash guard. I recently had my vehicle SERVICED Thirty five hundred miles after NEW engine install The dealership serviced my car didn't reset my service indicator 3 weeks later, my vehicle without warning said Engine overheated, so I pulled over immediately that display went off. My actual thermostat stayed under the center line in between cold and hot. I contacted the dealership and got my vehicle into BE inspected At that time, they said my coolant level was low and both heapeer. Hoses needed to be replaced and my engine needed to be flushed and refilled. I had those services completed. I picked up my car 5/24 it was OK on 5/25 My service indicator pop back on and at that time it was counting 58 days, so even after I brought it to the dealership's attention, they failed to reset it again. So I googled how to reset the service interval and did it myself. And about thirty minutes later, I was driving my car started shaking excessively And Woodin's accelerate, over 20 miles per hour in traffic. I had to put on my hazard lights and get me and my grandson to a safe place so that I could contact the dealership regarding this matter and they stated there was nothing they could do I had to wait until Tuesday I have put in a complaint with the Better Business Bureau, as well as consumer affairs. And also the county attorney's office for. Consumer fraud. This vehicle was misrepresented at the time of sale. It has countless safety issues. I need assistance

- Avondale 1, AZ, USA

The contact owns a 2020 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the shift assists malfunction warning light illuminated. The contact turned the vehicle off and restarted the vehicle. The vehicle was towed to the dealer; however, the failure could not be duplicated. The vehicle was not repaired. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 21,000.

- Miramar, FL, USA

Engine leaks oil. I went to the dealer and they blamed the other Hyundai dealer saying they stripped out the drain bolt. After all the back and forth they told me they will replace the drain pan. I scheduled to have the car dropped off and wasn-??t given a loaner. When I went to pick up the car they told me the ac bolt and bracket are broken and to come on Monday but the drain pan has been replaced. I went home and the car continued to leak oil and when I went back to the dealer and called them out they came up with every excuse in the books. Bolt is stripped, impact to pan, and so on. Long story short I went to fix the oil pan and they damaged the ac bolt so instead of telling me to come back to do everything they said they did the drain pan but the bolt would have to be done another day. I am waiting on a loaner car as I waisted a whole day without a car and the issue wasn-??t fixed. I have a receipt showing the work was done but it never was. The dealer is dishonest and unprofessional. Not sure how they get away with this. They need to be held accountable.

- Spring Valley, NY, USA

The contact owns a 2020 Hyundai Sonata. The contact stated that while her husband was driving 75 MPH, the brake warning light appeared on the instrument panel as the vehicle began to hesitate upon depression of the accelerator pedal. The contact stated that the vehicle decelerated to 20 MPH as her husband pulled to the side of the highway and turned off the vehicle. The contact called the dealer and was given suggestions on how to correct the failure; however, none of the options worked. After some time, her husband restarted the vehicle and the vehicle resumed normal operation. The next day, the contact stated that the brake light returned upon start of the vehicle. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 19,000.

- Grand Rapids, MI, USA

When accelerating hard (pedal to the floor) from approximately 55 mph, the transmission may not downshift correctly and loses power causing a safety issue. When attempting to continue accelerate at full throttle, the RPMs hang while simultaneously losing vehicle speed. Other symptoms noticed were slight vehicle jerkiness from RPMs bouncing up and down a couple of hundred RPMs. When letting off of the accelerator to a "normal" depression level, the vehicle upshifts into an appropriate gear and will gain speed (though sluggish). In the same drive (meaning the ignition was not turned off then back on), if attempting to push accelerator to the floor, the same results happen as stated before. Also in the same drive (after exiting the highway), from a stop at a red light I tested the issue again with the same results. No warning lights, messages, or other symptoms were present to indicate a malfunction. My safety was at risk because I merged onto the highway and noticed another vehicle approaching me at an unsafe pace. Due to the issue, the car had to hit their brakes hard to avoid a crash. This is also a safety risk because if it happens from a stop, the car may fail to accelerate appropriately when turning in front of traffic. The problem has not be reproduced, confirmed or inspected by anyone besides myself. A video of the issue as it occurred was recorded. This issue is not consistent and has happened twice in approximately 3 months. My Hyundai dealership's service department suggested the car may have went into "limp mode." Given the inconsistent nature of the issue, I did not schedule an appointment to have it looked at because I would have been charged if nothing was found.

- Cuyahoga Falls, OH, USA

Car is 20 months old and in that period the car has experienced on at least 3 occasions a problem with acceleration. After stopping and then attempting to accelerate the transmission had a problem engaging and increasing speed. It took probably 30-40 seconds to get from zero to 25 or so then engaged back to normal. Obviously dangerous if getting onto highway or turning in traffic. Dealership cannot replicate problem so they cannot analyze. Last instance was about 2 months ago March 2022. Similar to other incidents posted here.

- Naperville, IL, USA

1.transmission does not function properly at all times. It slips from time to time upon acceleration, (right after deceleration), increasing the odds of a collision when attempting to avoid other vehicles on a collision course with mine. 2.noise from steering column 3. three trips to dealer have brought no resolution

- Jamestown, TN, USA

The transmission since we got the vehicle has had random hard shifts. The software updates seemed to have alleviate some of the occurrences. How ever when it does happen now. The whole car shakes while at idle and shifts extremely hard. Almost like braking hard. The problem has not been reproduced at a dealership yet, taking it in ASAP for inspection. Noting relating to the power train has been replaced. Just a software update a while back. No warning lights came on the screen when it happened. My wife was going about 20 miles per hour when she tried to accelerate. It was hesitant than shifted hard, lurching forward than accelerated. When she came to a stop at the next light it was shaking the whole car.

- Fort Worth, TX, USA

The contact owns a 2020 Hyundai Sonata. The contact stated while driving 35 mph and entering the highway, the vehicle would not shift into gear and the vehicle was sputtering. The contact stated that the vehicle would not exceed 45 mph. The contact pulled onto the shoulder of the highway and shut-off the vehicle. No warning light was illuminated. The contacted restarted the vehicle however, the failure persisted. The contact pulled off the highway and had to restart the vehicle several times. The vehicle was taken to the local dealer - webb Hyundai merrillville (1000 81st ave merrillville in 46410, (219) 249-4961) where the diagnosis was not determined for the engine however, the contact was informed that the heating system was faulty and the instrument panel failed to provide an accurate warning light for the failures. The vehicle had not been repaired. The manufacturer was notified of the failure but, did not provide any further assistance. The failure mileage was 14,698.

- Hobart, IN, USA

Occasionally there is a serious delay when trying to accelerate. Car tends to jerk/buck when accelerating, usually in the lower gears. I have no idea if this is a transmission issue or a fuel injection issue, but my dealership has not been able to detect an issue and keeps telling me everything is normal when it clearly isn't. the car also has harsh downshifts especially going from 2nd to 1st gear.

- Elkhart, IN, USA

Following a firmware update to the obc for a recall, the vehicle transmission now has a severe delay responding to driver input. The transmission in this vehicle has electronic shift with pushbuttons. Previous to the firmware update, the transmission would respond instantly to driver input from these buttons. Following the firmware update, the transmission takes two seconds to respond. This delayed action prohibits driver emergency shifting, creating severe risk of an accident. In my vehicle, I recently was almost involved in a traffic accident when the delayed response from the transmission caused my vehicle to reverse into the opposing lane of traffic as acceleration was attempted thinking the vehicle had shifted into drive. Upon entering the active opposite lane of traffic, emergency accident avoidance was prohibited by the delayed response of the vehicle shifting into 'drive' in order to move the vehicle from the opposite lane of traffic. Previous to this instance, there have been delays in vehicle shifting which have nearly caused an accident when the driver attempts to place the vehicle in 'park', but the delay causes the vehicle to move forward as the driver removes their foot from the brake, and the car moves forward toward stationary objects and people. This has been reported to Hyundai and they have not responded yet. Furthermore, other obvious firmware issues in the vehicle have been identified, one in a different safety system.

- New Port Richey, FL, USA

Vehicle abruptly stopped in a traffic signal without giving any indications what so ever. When tried to restart it stalled pretty badly causing excessive vibrations. This had just 1900 miles on it. Vehicle didn't have any mil or any visible information about the issue. It created a huge traffic pile up due to the peak hour in which this problem started. Few days ago there was issue with starting but it resolved after couple of minutes, this time the vehicle had to be towed to the dealership and I lost my days work and pay. Biggest concern is how abruptly it stopped in a busy street.

- Laurel Springs, NJ, USA

Vehicle rough idled & eventually shuddered to a stop. This happened four times while in gear and idling at appx 1000-1500 miles. Between 1500-2000 miles, vehicle shut down while driving appx 60mph on a county road. At appx 2700 miles, mpgs drastically impacted when vehicle suddenly stopped shifting gears properly while in motion at appx 70mph on the highway. Check engine light appeared with message regarding ecs issues. Vehicle still drives, it just seems to struggle with efficiency and shifting correctly.

- Council Bluffs, IA, USA