2020 Hyundai Sonata complaints

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)

It looks like the fuel tank has expanded. My back seats are now lifted & will not push down.

I have a 2020 Hyundai Sonata SEL Plus. For the past month I been dealing with my CEL regarding Fuel Tank Pressure sensor and I end up replacing one from hyundai itself. After doing that I notice my fuel tank has expanded and I’m currently dealing with Hyundai & the dealership to see if they can make a recall regarding this issue or just fix it period since it’s a big safety concern. This been happening since mid April. My back seat lifts up from time to time and my fuel pump cover is bent. Below I’ll add some pictures so you guys can see how my tank straps are actually bent which is very uncommon for it to happen. I recently took it to the dealer last week after reaching out to hyundai corporate and they took pictures and send it for prior approval to see if hyundai is willing to replace this. I can’t fill up my gas tank, I constantly have to out between $15-$25 the most due to fuel mileage issue since the tank has expanded I get fuel mileage inconsistency

Driving 55mph on highway car slows down and make a pop nose and back seat comes up and I start to smell gas

An independent service center advise us that the gas tank had expanded which could have put my family at risk if exploding or catched on fired. This happend on June 15th 2024 while driving, a sudden explosion coming from the back of the car was heard. Little after the explosion like sound we perceived as if air was coming through the back as if we had a window rolled down. When pulled to check, i notice that the back seat was popped up. No warning on the car was giving prior to the incident. Will take car to Hyundai dealership to have it inspect by them and have a solution.

I was driving on the interstate when I heard a click from the back of the car. The gas gauge started to move downward as if I was losing gasoline. It eventually stopped and started moving back up, past where it was when it started decreasing. A little bit later the check engine light came on and the car started driving very sluggishly. I took the car into the Hyundai dealer and they found that the backseat was clicked out of place and a sensor was unplugged. This issue has since occurred multiple times. The back seat will pop out of place, the gas gauge will move beyond the gas that is in the tank, and finally the check engine light will come on and reduce the performance of the vehicle. The gas tank appears to be swelling and pushing up against the back seat which is causing it to pop. I had my girlfriend drive the car while I sat in the backseat and I could actually feeling something moving underneath the backseat. I have since gotten in contact with other sonata owners who have had the same thing happen with their vehicles. In other cases the backseat has exploded and flown completely off of the gas tank. I am very nervous to drive my car and think Hyundai should recall these vehicles before someone gets hurt.

Summary: The gas tank on this vehicle blew up/expanded rapidly to the point it could have erupted into a gasoline vapor fireball, killing the occupants of the vehicle or others. According to two Hyundai dealers, a failure in a check valve and the vehicle ECU programming caused pressurized air from the engine to be pumped into the gas tank, causing it to expand to the point of explosively popping out all of the sheet metal under the back seat. One Hyundai dealer service technician described the vehicle as, quote, 'a ticking time bomb'. There was no check engine light or warning at the time of this explosive event, although one occurred later. Hyundai has not offered to repair this vehicle. Please note that this potentially deadly issue is already well known to Hyundai/Kia. The Sonata has a sister vehicle from Kia that is the same vehicle platform called the K5. Kia issued a service campaign to address this extremely dangerous issue in April (TSB: SC288 K5 (DL3a) April 2024) which reads in part: "The subject vehicles may experience fuel tank swelling due to an issue with the PCSV check valve, which results in pressurized air to flow into the fuel tank." In addition, at last check an investigative reporter in Charlotte, NC has identified numerous Hyundai and Kia vehicles in which this has occurred. There's likely far more people who have already had this occur, and potentially thousands or hundreds of thousands of vehicles with this potentially deadly condition. (See: wsoctv.***

The fuel tank under the backseat expanded forcing the backseat up and causing the muffler to scrape the ground. The expansion of the fuel tank could have exploded due to extreme pressure. Vandergriff Hyundai in Arlington, TX has inspected the vehicle and confirmed component failures in the fuel system. The vehicle has been inspected and currently in the process of being repaired at the dealership. The check engine light was illuminated to warn of component failures approximately six weeks ago.

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

My vehicle is missing it's third brake light. We have confirmed that it was forgotten during manufacturing. The dealer won't cover it. They say call corporate. Corporate says dealer has to fix it. In the mean time I'm pulled over for improper equipment, and brake light being out. It's a serious safety issue, covered by federal law. They quoted over $1000 to have it fixed at my expense.

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.

While driving at about 45mph a warning flashed on my dash. I couldn't read it before it disappeared, but it was something about front collision., contact dealer. the car immediately lost all power. Everything was still running, but I had no acceleration. I had to back down a busy road into a vacant lot. I had just come off of the highway when this happened, if I had still been driving on the Highway, I would have been hit by a car from behind, since there was no warning at all. The car was towed to a Hyundai dealership. After a diagnosis, it was said to be the Throttle body. I had to wait for the repair because the part was on back order. I was told that there was another car there waiting on the same part. I am afraid to drive the car now, even though the repair was made. I feel this is a safety hazard, and that someone could be injured or killed because of this issue with the car.

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A lot of these models have wind coming through the door making a whistling noise, it’s very distracting to drivers and multiple people complaining about it online.

In May of 2023 my check engine light came on. Took the car to the dealer and the diagnosis was that the egr cooler was the culprit so they replaced it and everything was fine until 12/21/2023. I am driving on the highway and suddenly I hear a loud alarm and upon checking my instrument cluster I see a warning for engine overheating, the heat was on but suddenly the smell of something burning covered the entire cabin of the vehicle. I had to pull over to the side in the middle of a busy highway in freezing conditions and shut my engine down to avoid further damage. I believe the egr cooler has failed once again inly this time leading to a more terrifying experience. My car was towed to the dealership but I am worried for myself and others with similar vehicles I would not like anyone to experience what I did. I have seen multiple online forums with people complaining about the same situation. Mileage was around 57,900 miles when this occured. I bought the car with 30,000 miles as a certified preowned model. I kindly request for a recall for affected sonatas manufactured from the year 2020 to ensure our safety on the road. If it was not for warranty I would not be able to pay for the repairs

I was driving Home from work and I fell a sleep behind the wheel and Hit a park car. The police report states that my impact speed was 50mph. My insurance company is very concerned that my Air Bags or sensors are defective and that I contact you immediately. Due to the damage and impact of the accident.

Defrost doesn’t work because harness melted and blew a fuse

While exiting the vehicle there was a loud pop from under the drivers seat. Upon inspection the left front weld attaching the drivers seat to the positioning bar to raise and lower the seat bottom had failed and separated completely. This causes the front seat bottom to sit at an angle and not fully attached to the structure of the car, causing a severe safety issue in the event of an accident as the driver is not properly aligned for the airbag, the seat belt no longer aligns correctly on the body, and there is a greater risk of full seat detachment in a collision or while simply driving.

Sunroof shattered/exploded for no known reason while driving. Resulted in glass falling towards cabin of vehicle as well as loud bang.

Malfunction cause unanticipated acceleration in sport driving mode.

Tonight on 7/29/2023 after driving between 5-10 miles at night with very light traffic, my dashboard flashed a message telling me "Forward Safety system disabled. Radar blocked." After receiving this message and it clearing from the digital instrument cluster, a small triangle appeared with a exclamation mark. After driving between 1 to 5 miles further down the interstate the triangle cleared from the screen. There is no damage to the grill, or sensor, and no indication of mechanical issues as I was driving down the road. The grill and sensor both also have little to no dirt as I routinely wash my car each weekI have read through multiple other comments like me stating nothing whatsoever is on the front grill that could be obstructing the sensor. And like the other complaints, if there is no warning light, there is no code stored!

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.

Hyundai updated the software for the display and made the font smaller which makes it difficult to read and a safety issue especially when driving at night. I contacted Hyundai and they say that if it is not in the owners manual there is nothing they can do. I have tried to explain to them it is a software issue that came about when their software engineers updated the software and it makes this a safety issue and they have no way to revert back to previous versions.

Exterior paint is peeling and stripping. Hood, doors, front and rear bumper, side skirts, and front lip.

Paint on hood of car is peeling off, down to bare metal

While driving my cars a light starting blinking and my engine light came on and the car lost power This has happened on at least 3 occasions and I had to pull over upon starting the car after a few hours all returned to normal I reported this to dealer and they could not find a problem

I took my vehicle into the dealership when it was under 12,000 miles for another issue and mentioned a problem with the headlight on the right fogging up with moisture. I was immediately told that this had to be seen with their eyes because light cost more than $1,000. It has continued for over 1 1/2 years. Early this month, I took a picture at night and in the morning. The service manager wanted to add another hoop; can you get a picture of the water in it? The water is droplets on the light, decreasing visibility on the road. Pictures are attached. There is one picture that shows the left headlight with no issue.

2020 HYUNDAI SONATA. CONSUMER WRITES IN REGARD TO GRINDING NOISE WHILE DRIVING. THE CONSUMER STATED UPON INSPECTION BY TOYOTA, IT WAS DISCOVERED THAT THE UNDERSHIELD HAD COME LOOSE AND DRAGGING.

2020 Sonata......Steering wheel has started to make a raspy, rubbing noise when turned. When researching this problem on U tube, it is apparently a fairly common problem with Hyundai vehicles. The fix requires that a bearing in the steering be replaced. If not replaced I would imagine that the bearing would eventually seize up and the car could not be steered. I checked with local dealership and they were not aware of the problem and couldn't tell me if it would be covered by my warranty. I only have 9500 miles on the vehicle.

The Panoramic sunroof has a line fracture crack which exploded for unknown reasons. A rock or any foreign object DID NOT hit the sunroof to cause it to shatter. Residue from the glass shattering got into my eyes. Freeman Hyundai stated that an object hit the sunroof it would not be covered under their warranty. A object did not hit the sunroof and it looks like Hyundai has a history of sunroof shattering unexpectedly. There were no warning signs prior to the sunroof shattering.

The AC Fan in my car quit working. Took it to a repair shop where I was told that the AC Blower Motor went bad. The blower motor was drawing too much amps and caused the blower motor fuse to melt into the wiring harness for the blower motor along with melting several other fuses nearby including the fuse box. The cost to repair this correctly fixing and addressing all parts damaged was $5000. Because my vehicle is out of warranty due to mileage I contacted Hyundai who stated that I had to go and pay another diagnostic fee at a Hyundai Dealership to have them look at it. They continued to tell me that the vehicle was out of warranty but would not assist in providing information to get the issue resolved at no cost to me.

Steering parts being replaced many times, and the engine oil is low after I just got an oil change a week ago. Excessive engine oil usage with no idea where it is going.

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.

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

I first begin having an issue with the idle speed. It would jump up to 1,500 RPM, which is twice the normal 750 RPM level It started almost from the very beginning when I purchased this car new in early 2020. I mentioned it at first oil change at dealer at 3,500 miles. I was told it was normal. In the beginning it would come and go. Sometimes not happening for weeks in-between episodes. Then it started to have the check engine light come on after it would happen and stay on. I took it back while light was still on and they kept the car for several days. Said it was the EPV valve and replaced it. Car operated fine for a few days then started up again. It also started to idle up and down from 1500 down to 500 in a rapid succession. I was able to get it to stop sometimes by turning engine off and them back on. Again I contacted dealership and took car back in. They gave me a loaner car and kept my car for over a month. This time they replaced the computer they told me. I did not have car for more than a week before it started doing it again. It has gradually gotten worse and happens more often now. It has also started to have the Forward Collision Avoidance warning come on in addition to check engine light as well. Just this week it actually just died on me while driving and forced me to pull to side of road. Turn off the engine and restart the engine. This happen 3 times in succession. Dealership does not seem to have any idea on what is going on and have been not very helpful.

While driving to work on 05.20.2022 my sunroof exploded for no apparent reason. I called my insurance company and they told me to take it to my dealership. so I did.

Whenever I am close to a Tesla in traffic or at a stoplight, my parking sensors go off. I believe that the frequency of my Sonata parking sensors is being interfered with by Tesla sensors. This could lead to unexpected braking in traffic. This problem has not been reproduced by a dealer or independent service center. It has not been inspected by the manufacturer, police, or insurance representatives. Warning sensors go off.

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.

- Shifter system malfunction - Unable to use the shift buttons - Received system error on dashboard that read, "Shifter malfunction! Service immediately." Visited two dealership, who saw a photo of the system error message. Vehicle was inspected by the dealership; however, no support could be given due to the dealership not having a code for the issue. - Dealership was made aware of the issue back in November 2021; however, first available appointment with technician was not until January 2022.

Steering wheel makes whining/scrubbing noise when turning. Steering a vehicle is a critical component of safety and being able to avoid dangerous situations. The problem has been reported, inspected, and confirmed by a dealer. The component has not been inspected by the manufacturer, police, or independent service center. There were no warning messages, lamps, or other symptoms of the problem prior to failure. The problem first appeared when the vehicle was under 15,000 miles. The dealership advised that the worm shaft assembly needs to be replaced.

The contact leased a 2020 Hyundai Sonata. The contact state that the radar in the vehicle interacted with the radar in Ford vehicles. While parking in a parking spot there was a beeping sound detected. While at a stoplight with a vehicle in front to the side, the radar engaged when a Ford vehicle drove up. The contact stated while turning nearby another Ford vehicle the radar engaged and the driver applied the brakes. The Forward Collision-Avoidance warning light was illuminated. The contact called the local dealer, but the vehicle was not taken to be diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 6.

On Nov. 2020 my husband and I purchased a new 2020 Hyundai Sonata with 2mls.off the showroom floor at Daytona Hyundai dealership, Daytona Beach,Fl. We moved to Ga.One day in December, I opened the driver side back door to put groceries in the backseat and I noticed water on the door frame at the bottom ,I thought maybe I might have left the window part of the way down and rain came in. a few weeks after that I went into town I was going to put groceries again in the driver side back door and water sitting on the bottom of the frame inside the door . The window was up .So this went on every time it rained. I drove my car to Rome GA at Heritage auto group they sell Hyundai’s And also service them. [XXX] in service department he’s the manager I told him about the door where I was finding water at every time that it would rain. So he told me to bring it back when I was able to leave it. For the next couple months I had a medical emergency with our son that lives in Florida when he lost eyesight. With the specialist diagnosis he had uveitis in both eyes. The first trip was in April 2021 and I 95 southbound in Florida maybe past Saint Augustine we were driving 60 miles an hour the traffic was very heavy and all three lanes, I was in the center. It was within seconds that I seen something rubber in front of me in my lane ,it could not be avoided or I would have caused a accident with other vehicles. I ran over it on the right side front bumper so my son and I decided to drive it on

The contact owns a 2020 Hyundai Sonata. The contact stated that while depressing the brake pedal, the front of the vehicle was wobbling. The vehicle was taken to a dealer where it was diagnosed that the rotors needed to be resurfaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 11,000.

Driving on the Interstate at 65mph the car suddenly goes down to 5mph. Unwanted deceleration! At the same time the dash warning lights come on. Check engine and ABS. This happened 3 times now. 2 times on the Interstate in heavy traffic and once going 35mph on a back road. Miraculously we were able to pull over without any cars slamming into us. This unwanted deceleration happened on July 28, August 18 and Sept 13. Each time after pulling to a safe area we turned the engine off, waited a few minutes and turned it back on. Then resumed normal driving speed. Brought it to the dealer after each time. This shut down started after the car was only 4 months old with 2,983 miles on it.First time they said they couldn't find anything wrong and reset the computer, said if it happens again they will look into it more. The second time they replaced a Body Assy-Throttle and Gasket. The 3rd time they replaced the front wiring assembly control. I have all the repair paper work. We were driving playing Russian roulette wondering when it will happen again. With cars speeding around us we were lucky no one was close on our tail. This is an extremely dangerous situation. Each time it was beautiful sunny weather, two times heading to the beach, 3rd time heading to NH after 2 hrs of driving and one hour stopped, resumed driving for 20 min when it happened. No common denominator. I hope that this is not happening to others. I have reported this issue to Hyundai Motors America and they have offered

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

The driver seat belt pops out sometimes for reasons unknown. The speakers suddenly stop working at random times so I got lost while listening for navigation directions safely paying attention to the road instead of watching the screen for upcoming turns. And the biggest one, a few times I almost crashed into oncoming cars and guard rails because if the road has a dip the sonata decides to jerk hard to the side and overcorrect itself when lane assist is on. When the road is level it just beeps annoyingly loudly when it can't see the lines or you accidentally cross over it, but does not actively assist even tho active lane assist is on. This is a major safety issue!!!!!

The automatic shut off. When the car is locked I can run it for a total of 20 minutes with auto start, when it's unlocked I can run it for a total of 60 minutes. Sometimes because of my job I need to auto start it and run it for longer to either warm up or cool down and it is unsafe to leave it unlocked. There should be an option for me to turn off the time limit and not have it reset every time I restart the car! When I'm shopping and I need to leave my dog inside for instance and it's 91 degrees outside, I should be able to lock my car and let it run for as long as I need to be in the store without worry it will shut off with him inside and suffocate him in the heat. This is another HUGE safety issue!

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.

The Contact owns a 2020 Hyundai Sonata. The contact stated while driving 60 mph, the vehicle abruptly decelerated to 30 mph. The contact also stated that previously the windshield wipers failed and the driver’s side window failed to roll all the way up. The vehicle was towed to the dealer to be diagnosed. The mechanic was unable to retrieve a diagnostic trouble code. The contact stated that the dealer could repair the driver’s side window and windshield wipers. The manufacturer was contacted and informed of the failure. The failure mileage was 16,000.

Driving, car started making a weird sound followed by a warning light on dashboard with dinging sound to correlate... car became difficult to gas, vehicle motion was lagging where I just knew I had to pull over Bc this car was going to literally stop began to slowly (Bc that’s all car would allow) to proceed forward and I was forced to come to a haunt as I pulled onto side of highway. I then could no longer move it. Turned car off for minute then returned to try to start again, car would not accelerate at all nor turn on fully.. I was forced to wait hour to get a tow... took to shop, no problem such was found , car started & ran again ... this is 3 days later the car again continued the same exact pattern & I was unable to drive any further and forced to once again to get tow. This has to be something of bearings with engine, this car mode is not on list but IT certainly is an issue that I believe is related & should be rectified by Hyundai.