Other Fuel System Problems of Hyundai Sonata - part 2

I received a notice in the mail my car needed a software update. I went to the dealership to have the update performed. They informed me there was a service campaign for an expanding fuel tank due to pressure. They were unable to return my car to me at that time stating they were awaiting direction from Hyundai motor of America for the fix. The fuel tank expanded so much it bent the body of of the car underneath the backseat. It also broke the support straps. The dealership stated it was a known issue with a vent valve. Causing the fuel tank to swell so much it damaged the body. They have had my vehicle for 9 weeks with no direction as to what to next.

See all problems of the 2020 Hyundai Sonata 🔎.

On [xxx] at approximately [xxx], my [xxx] daughter was using my car to go to work. When she called us and informed my husband that the car did not start. At that point he asked to video call him so that he can visually see what was going on. She was directed to turn on the car again at and that point, the car started then smoke was noticed from coming out of the hood. My daughter managed to open the hood where flames emerged from the center of the engine. She then ran in the house to get a fire extinguisher and managed to put it out and it reignited. She then made a second attempt with another fire extinguisher where it briefly subsided and then grew larger. At that point the fire dept arrived and successfully extinguished the fire and deemed the car totaled after the fire marshall carefully inspected the car. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2012 Hyundai Sonata 🔎.

Car is a Sonata hybrid limited equipped with a solar roof which charges the hybrid battery. Vehicle began to cut off battery power while parked, requiring the use of a factory equipped 12v override switch in March 2025 after approximately 3. 5 years of ownership. This occurred multiple times, often when the car was parked in the sun but independent of how long it had been driven prior or how long it had sat without being started. Evaluated by two Hyundai dealers; second dealer found a fault in the "solar dcdc converter" as well as the hybrid battery bulging. Battery module replaced. Unclear if this resolves the issue or it will recur again. Am speaking to Hyundai regarding battery warranty extension as vehicle had 88000 miles on it at the time of the issue starting. Online fora (e. G. , reddit, facebook) note other customers who have had similar problems with similar fixes. - [xxx] - [xxx] - [xxx] - one individual in this thread had complete power loss while driving down the highway this issue potentially risks stranding customers, and if the hybrid battery continues to bulge increases the risk of fire which could lead to property damage, personal injury, or death. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2022 Hyundai Sonata 🔎.

So my car started to stall when I started it an when I started goin down the road like it wanted to die. Then I started to smell gas very strong so had a code tester put to my car an I have 6 permanent codes. An not only that im smelling oil strong an noticing big oil spots under my car. So I look under the hood an behind the turbo I see oil behind an underneath the turbo. I definitely didnt feel safe driving but now its not even drivable. I purchased it couple months ago from an individual an I cant belive the amount of problems this car has. Im a single mom an trying to support my family an its hard to now with a non running car. I've put quite a few parts hoping it would fix some of the problems an nothing has. I absolutely love the car an very beautiful but unfortunately to many problems with it. Eninge, gas leaks, timing.

See all problems of the 2013 Hyundai Sonata 🔎.

My wife and son experienced a terrible situation on the way home from training. They had to stop at the nearest gas station due to the vehicle showing extremely low gas in the tank during a short drive home. The fuel gauge initially showed about half a tank but drastically dropped on the way home. They stopped at a gas station to add fuel but during the process, fuel starting spewing out of the tank. The vehicle was scheduled to be dropped off at a later date for an open recall (service campaign 9b1). I called the dealership and told them I needed to get the vehicle in right away due to the incident. After bringing the vehicle to Hyundai, they told me that the fuel tank exploded causing the tank to swell all the way around. Because the tank is located under the rear seat, we constantly heard air coming in due to the rear seat not seating properly. The check engine also was on and we smelled fuel while driving the vehicle. Hyundai representatives has been avoiding my calls to the point where I had to go in person for an update. Apparently, a district manager had to come inspect the vehicle to advise the dealership how to write up the request to send to corporate.

Unknown cought fire under the hood was engulfed within minutes.

Service campaign 9b1 that my gas tank has explanded/exploded due to the issue noted in the subject line. As you can see the whole bottom of the backseats have been raised up imcluding the part that connects to the gas tank itself. My car is immobilized and not drivable during this time. What is the next step to take?.

I have had this car checked out 3 times and on my way to the 4th appointment. I can be in the middle of the road or pulled up in my driveway the rpms go crazy shuts off every light comes on then clicks and I have to waite and try to restart. This car has been a problem since we bought it brand new even the chrome has come loose on it. Took to 1 dealership they said it's not throwing a code so nothing they can do I pulled out of the dealership onto the busy highway and the rims went crazy lights came on and it died called the mechanic that said nothing was wrong he came out got it running took it back came back said nothing showing up so there was nothing he could do. I'm driving another 3 hours away hoping I make it to another dealership that said they would look at it after I sent pictures and a video to the mechanic. I will never buy another Hyundai again and definitely tell anyone I know not to.

See all problems of the 2023 Hyundai Sonata 🔎.

My 2018 Hyundai Sonata (approx. 60,000 miles) began consuming excessive oil, and the engine started smoking while driving. My wife barely made it to the dealership — the car was unsafe, struggled to stay running, and visibly smoked from under the hood. Hyundai acknowledged the oil issue but refused to cover engine replacement. Instead, they approved a one-time combustion chamber cleaning and requested we drive the car 1,000 miles to "see if it gets better. " this is a major safety concern. The vehicle is part of a group of Hyundai models known to have defective theta ii engines that have led to engine failure, fire risk, and recalls. This issue is widespread, and Hyundai is not taking proper responsibility for defective engines in cars like mine.

See all problems of the 2018 Hyundai Sonata 🔎.

I experienced an issue where the gas tank in my 2020 Sonata began to swell and emit loud popping noises while the vehicle was parked. I took it to the dealership, and Hyundai corporate eventually acknowledged the issue and agreed to buy out my loan. However, no official recall has been issued for this model year. This problem has had a major impact on my life. I lost my job due to not having transportation for over two months, and the stress of not knowing whether my vehicle was safe made it even worse. I had to upgrade my insurance for a loaner I never received, take financial hits, and go into deeper credit trouble—all while also recovering from a serious injury from a previous car accident. I now have to start over with a new loan while my credit is already damaged. I’m submitting this report not just for myself, but to ensure that other 2020 Sonata owners are protected and made aware of this issue. I believe this is a serious defect that warrants official investigation.

Fuel system expanded back seat.

The car would excelerate while in park. While I was pressing the brakes the car would jerk forward, it would not just quietly idle. While driving the car would randomly speed up or slow down. Sometime it would sound like it was going to shut off and start vibrating.

See all problems of the 2021 Hyundai Sonata 🔎.

On [xxx], in washington, d. C. , my 2013 Hyundai Sonata experienced sudden engine failure, leaving the vehicle inoperable. My goodwill repair request was denied within 30 minutes, without a proper inspection of the rod bearings (a known failure point covered under the txxi extended warranty) or the fuel pipe recall—a known issue that could pose a fire hazard. Hyundai cited suspected maintenance neglect, but I have documentation of regular synthetic oil changes. Despite having over 200,000 miles, a firestone inspection from September 2024 confirmed the vehicle was in good condition prior to the failure. Additionally, Hyundai theta ii engines are widely known to suffer from excessive oil consumption, a defect that can lead to premature engine failure even in well-maintained vehicles. Hyundai has replaced engines in vehicles with similar mileage under the same extended warranty, yet in this case, no proper inspection was conducted before denial. Safety concerns: the fuel pipe recall was not inspected, raising concerns about whether unresolved recall defects are leading to engine failures or fire risks. The airbag clock spring, covered under Hyundai’s txxa extended warranty, was not inspected, despite the airbag light being illuminated, potentially affecting airbag deployment in a crash. The vehicle failed without warning lights or error messages, creating an unsafe situation. Hyundai’s failure to inspect recall-related issues before denying repairs could impact other affected vehicles on the road. I request that the NHTSA: ensure Hyundai properly inspects recall-related components before denying repairs. Investigate whether Hyundai is improperly denying warranty and recall-related repairs, even in cases where similar vehicles have received replacements. Determine if the unresolved fuel pipe recall and airbag clock spring defect pose broader safety risks. This issue has been reported to Hyundai corporate, but no proper inspection has been performed. Information redacted pursuant to the freedom of informatio.

Car keeps jerking also it’s something going on with the fuel injections I’ve had to get them replaced twice. Please help.

I took my car in for a standard oil change and tune up. They found out that the fuel tank had expanded to the point where it caused significant damage to the metal frame. The Hyundai dealership sent it to the local body shop for an estimate for the frame, they sent it back because the dealership hadn't removed the gas tank, then the dealership sent it back to the body shop. It's been 3+ weeks, my car is still in the shop, and I haven't received any indication of whether my car is able to be fixed. The dashboard never displayed any warning messages and there were no symptoms of the problem. I had no idea the gas tank had expanded and could've caused an explosion or fire.

Took my car in February 10 for a recall that pop up on the app and today is June 22 and I’m getting all the run around and different dates for my car to be ready but everything it’s time to pick up my vehicle something comes up and they told me they took my car back to the body shop for the recall issue. All the information are added on the file.

The vehicle has begun to vibrate/shake badly but manageable. When a code reader was connected to the vehicle both codes 7e9 and 7e8 showed up. Upon researching, information has been found that these specific vehicles have been known for recalls due to fuel hose issues. If I continue to drive this vehicle without the issues being resolved which is not my fault, I jeopardize my son and I’s lives as well as any potential future passengers.

I had bought this car off facebook marketplace after confirming with my dad that it was a good car, when I had finally saved enough. After I took it home the check engine light had come on not too long after, the engine stalls when turning the key, pressing on the brake helps start the engine. Turns out the car was a salvage title and my dad didn’t know that and I didn’t know what that was.

See all problems of the 2011 Hyundai Sonata 🔎.

Check engine light came on with a odb code of p0300. Engine started to run rough and mileage dropped substantially. Upon arrival to my home due to safety issues I turned off car and and let it cool. My father read the odb with a code reader and said it smells like gas but we will look at in the daylight. Today upon removing the engine cover and checking the spark plugs we discover stains and residual stains on the ignition coil packs and directly under the low pressure fuel line where it connects to the high pressure fuel pump. It seems the plastic clip/connector is leaking at anout the rate of one substantial drop per 3-5 minute period. This could cause an out of control engine fire. Dealer was contacted and while there are two recalls regarding other 2014 hyndai Sonatas for the same exact problem that this VIN was not covered by the recall and the repair cost would be 300 for the fuel line plus labor.

See all problems of the 2014 Hyundai Sonata 🔎.

My gasoline delivery hose/line/pipe/fitting is leaking near the spark plugs as checked by a tire plus mechanic. The car is not safe to drive. Hyundai refused to fix my car under the campaign 22v312000 that addresses this specific issue. They would not even open the car to see the pipe leaking. I would like to know if my car can be added to the campaign 22v312000.

When driving. Slow down to turn or to use round about car goes into ev. When I go to accelerate the gas motor will not re engage and the hybrid alarm system will go off. I lose all power to go any where. I have to pull over shut my car off give it a min then restart so the motor will come back on so I can drive again. I have to do this mulitple time in a 20 mile drive.

I was driving into work on a major road (about 45 mph) when my 2023 Hyundai Sonata stopped accelerating and my engine gave out. Initially I thought I was accidentally pressing on my break pedal but when I realized I wasn’t pressing the break, I had just enough time to turn on my hazards and get out of traffic and onto the shoulder of the road. I was stuck between a main exit and the major road. My battery, oil, and engine lights came on (no service lights had been on prior to this incident) and my car was just very slowly rolling before it automatically engaged my parking break - which makes me fearful of what would have happened if I had still been in busy traffic. I could gotten very badly rear-ended. My car only has just over 5600 miles and I never had any issues with it before and kept up with the general maintenance. I attempted to restart my car to no avail and about 30 minutes later I was able to restart my car but there was a very strong vapor smell in the cabin of my car. I got my car towed to a dealership and was informed one of my fuel injectors was misfiring/gone bad - similar to many other incidents on this site. I asked the dealership if they were able to view the state of my other fuel injectors and was told they were unable to do that, so I am unsure if other fuel injectors will go bad in the future.

Good afternoon. My issue is related to an existing recall that Hyundai motor sent to me back during the beginning of January 2025 for a gas valve, tank inspection (replaced if necessary. ) and ecu computer update. I've been to a total of 4 Hyundai dealers and none of them have been consistent with this recall. The first dealer is "future Hyundai" in concord, California. Initially, I'd took my car there for both recall and sound coming from the gas tank and my fuel level dropping. I was told by a service advisor by the name of hayley, that it would cost a diagnostic fee to locate the issue. I didn't have the fees. But, seeing that the gas tank was part of the equation. It was free. The gas tank inspection was never done. I was told by hayley that the fuel valve was replaced. But they mechanics only done a quick visual. I wasn't reassured that my issue was resolved. So I'd took it to a another Hyundai dealer. This dealer told me that part of the procedure is to take off the tank and inspect it. I didn't get that far because I was told that a tool that was used is used to take off the tank was broken. A bleeder tool. Which doesn't make sense, because the tool is used for bleeding out air from the fuel system. "allstar Hyundai. " the last two of the 4 dealers, "san leandro Hyundai" and "freemont Hyundai", told me that my fuel pressure hose in my gas tank and had swelled up. San leandro dealer told me that my gas tank expanded. But the "freemont dealer" only mentioned the fuel hose. But never mentioned the gas tank. But decided to add it anyways. None of these dealers have been consistent regarding the recall. "freemont Hyundai", the last of the 4, the service man told me that my tank is available. But his story changed from the time that I can get the job done 4 times. To having to have my car for two days before they can order the part. He'd order the parts, verified to me, when I was at my appointment. But now that conversation changed.

The engine shuts off, doesn’t start, check engine light flashing, losses power, jerks while driving it, I will get it up yo speed then will shut off or won’t move.

Gas smell on the passenger side front seat.

See all problems of the 2015 Hyundai Sonata 🔎.

- component or system that failed: engine (cylinder #4 misfire) - safety was put at risk twice: once when knock sensor went off on interstate (October) and engine went into limp mode (aka protection mode). Required a tow from the, which was tricky with a vehicle full of passengers. Safety was put at risk gain when vehicle began to stutter/sputter on interstate (December). Drove 4-cylinder vehicle essentially on three cylinders an hour to dealership - problem has been confirmed by dealer (southern states Hyundai, raleigh, nc) - vehicle has been inspected by warranty inspector, who requests approval before disassembling engine to diagnose issue. However, based upon maintenance records and manufacturer's history of engine issues (more on this below), owner should not be liable for investigating a well known issue. At the time of this writing, the issue has been escalated beyond the dealership and warranty to Hyundai motor America, and currently awaiting the results of their findings. - symptoms of the problem include constant oil leak from vehicle purchase in may 2024 up to engine failure in December 2024. Various temporary remedies (oil changes and repairs, including oil drain plug gasket replacement, crush washer replacement, and replacement of cracked oil pan) did not fix the issue. Additionally, in the October incident, Hyundai dealership (sport durst Hyundai, durham, nc) simply updated the knock sensor detection (kds) software, despite the vehicle previously receiving the update in 2019 (this can be verified). Finally, owner, noted "engine knocking" (aka 'tapping') in vehicle prior to engine failure. - Hyundai (the manufacturer) settled a class action lawsuit in 2021. Vehicle is one of the vehicles listed under class vehicles, but dealer, nor warranty company, nor Hyundai seem to want to resolve issue, which both alienates owner and presents a safety hazard, as the vehicle is unsafe to drive. All claims here will be supposed via documentation and images.

The low pressure fuel line connector to the high pressure fuel pump failed and sprayed fuel over the hot engine. This could have easily cause a vehicle fire and death. This is a know issue and is covered by a safety recall on 2013-2014 Hyundai Sonatas (Hyundai technical service bulletin 20-01-030h). The same issue occurred on this 2015 Sonata that was built in June 2015. A temporary repair had to be made until Hyundai could inspect it. Vehicle was taken to holler Hyundai in winter park, FL and inspected. Results were forwarded to Hyundai motors America and the repair was declined because the 2015 models were not included in the recall. It is our belief that the same connector was also used on some 2015 Sonata models prior to the issue being discovered.

I was driving a 2016 Hyundai Sonata on a mountain highway and it started to run rough and lose power dramatically when accelerating. A dangerous situation on a steep curvy highway that has many one lane sections. Shortly thereafter a dash light came on. There was no warnings or dash lights or symptoms prior to this incident. I took the vehicle to a mechanic and ran the code. It said there was a misfire in cylinder 3. Replaced the ignition coil and spark plug for cylinder 3 and it did not fix the problem. The mechanic then pulled the motor to check the valves. Valve 3 was burnt, had a hole and stuck open. The car had approximately 75,180 miles. Well within the warranty time frame of 10yrs or 100,000 miles for an original purchaser. The mechanic had the valve machined, and replaced the head gasket and reassembled the the motor. I picked the car up and drove it home. Within 3 days I noticed an oil leak under neath the car where the engine bay is. I took the car back to the mechanic and he diagnosed a hairline crack in the oil pan. After some research I came across a letter from NHTSA on a defect investigation of Hyundai/kia oil drain pan assemblies. This is exactly what happened to my car! I have paid 3500. 00 to fix a car that has less than 76,000 miles. Hyundai needs to do better.

See all problems of the 2016 Hyundai Sonata 🔎.

Literally for years I have been taking my car in to rick case Hyundai with the complaint of smelling gas even when the car was parked for long periods. Each time they said they fixed with different items. Gas cap, a part on the catalytic converter, etc. The problem never resolved but I noticed it only happened when the tank was more than half full. I got a video of gas dripping out underneath and took the car to rick case and gave them the video. My car has been there ten days because they first tried to say it was a seal on the fuel pump. This time I said that seems unlikely cause that only happens when tank is full and persists even after car is parked many hours. Now they report they found a pinhole leak in the gas tank. I will upload the video if this form allows. This does not appear to be a pinhole leak to me. I first noticed this around 2019. Unfortunately the video is mp4 and I cannot upload it.

See all problems of the 2017 Hyundai Sonata 🔎.

I took my vehicle in for an oil change and was advised that my car failed a recall. The pcv valve failed. After the dealership, explain this problem to me I no longer feel safe driving this vehicle. Imagine being told that the fuel tank can expand and pop up the backseat of your vehicle at any given moment or even cause the car to blow up and no warning lights coming on to alert you that this part had a defect.

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.

After starting, got a warning stating check hybrid braking, do not drive. When going forward, brake pedal went to floor, heard heavy grinding noise and vehicle stopped accelerating. Had to use the emergency brakes to avoid an accident. Hyundai says they can’t find a problem. Now I can’t even drive it back to the dealer! did an internet search and many other hybrid owners have reported the same issue. I just want to have Hyundai buy the car back at this point. It only has a little over 50,000 miles on it.

I tried pumping gas and the car would not let me pump the gas into the car. I had to hold the the gas pump hose and pull the trigger myself to pump the gas, which would still make the clicking stop noise that stops the pumping of the gas. Then when I started driving, the check engine light came on. Went o'reilly to test the check engine light code and it popped up with a p0449 code for the evaporative emissions (evap) vent control valve.

Fuel pump went out.

See all problems of the 2019 Hyundai Sonata 🔎.

My engine coolant level keeps going down but no leaks evident also heavy white smoke coming out from the exhaust. Finally engine overheated.