2018 Hyundai Sonata complaints

Panoramic sunroof came loose on highway and bent up 90 degrees making vehicle undrivable.

This engine consumes oil rapidly to the point i have to add quarts of it constantly . This results in the spark plugs deteriorating at a rapid rate and the coil packs as well. The car only has 75,000 miles but the problems began to start around 69,000 miles because of these issues and the engine and burning oil because of the rings and pressure it begins to shake rapidly and sputter and stall out.

The engine stalls when driving, loses power, hard time to start. It uses an extensive amount of oil. Losing power/stalling can result in accident or fire in my engine. Yes check engine light came on said it was coils/plugs changed them 2xs already. Took it to a mechanic was told there’s a recall on engine it’s a valve that is not getting air through that can potentially case a Fire in my engine.

The car went into limp mode they have problems with the knock sensor and that is what it threw to the computer and I changed the sensor and went away and now limp mode again and computer says basically the same thing there is a software update and the engines are failing

The contact owns a 2018 Hyundai Sonata. The contact stated that the vehicle needed multiple attempts in order to start. The contact stated that once the vehicle was started, she noticed that the low engine oil pressure light was illuminated. The vehicle was taken to a local dealer, where it was determined that an oil consumption test needed to be completed. The vehicle was not repaired. The contact had stated that prior to the oil test being recommended, she had observed that the vehicle was consuming approximately five quarts of oil per 2,000 miles. The manufacturer was notified of the failure. The failure mileage was approximately 57,000.

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.

The engine is burning through oil at a rapid rate. I probably get 2,000 - 2,500 miles before it needs a complete refill and the problem is getting worse. I was not due for an oil change recently around 2,500 miles and my engine started shaking, took it to the shop and the oil was gone without the oil light going off. This resulted in me needing to replace spark plugs and all engine coils. The repair shop recommended I sell my car because of the amount of Hyundai's he sees with this issue.

The contact owns a 2018 Hyundai Sonata. The contact stated that the oil pressure was prematurely lower. The contact stated that while performing the oil change as an independent mechanic, the contact noticed that there was a significant amount of oil in the oil catcher, and the oil pan was fractured. The vehicle was taken to the dealer, where the contact was informed that the oil pan replacement was not covered under warranty. The vehicle was not repaired. The contact related the failure to NHTSA Action Number: DP22003 (Engine). The manufacturer was notified of the failure and a case was filed. The failure mileage was approximately 64,400.

The engine burns oil, I have to get spark plugs every two months, and put oil in it almost every week. The check engine light is now flashing and is throwing more sensors. The paint on this car is also all peeling off.

2018 Hyundai Sonata Registered owner [XXX] Vin [XXX] Which qualifies for a replacement engine under the "recall" and "class action" due to engine oil consumption damage. On [XXX] I was driving home from California, and my 2018 Hyundai Sonata made a loud noise and stalled on me while driving on the freeway. On Jan 2, 2025 I towed my 2018 Hyundai Sonata to ABC Hyundai for repairs. I was told the engine failed or locked up. I have a drivetran warranty up to 150k. My vehicle currently has 115k. However, Hyundai denied the engine repair stating that I neglected the maintenance on the vehicle. They were requesting oil change receipts from 2018 when I bought the car. I've submitted all oil change documents that I could find. Most auto shops have purged their system, updated their software and also got entirely new systems, therefore those receipts were not found. Carfax also has a record of oil changes. I did not always take my vehicle to the dealer for oil changes since our family has a certified mechanic that can vouch for all the other oil changes done on the vehicle. Including tune-ups. The dealer and I have provided several oil change receipts approx. 18+ carfax, Hyundai, family mechanic and misc. receipts. That's should be more than enough evidence for Hyundai to honor their warranty. Please help. NOW HMA says t claim for oil consumption and repairs were denied due to the vehicle being outside of warranty based on time and mileage. Once a claim is denied that is the final deci

BSD system stopped working one day along with the Rear Cross Traffic Alert.The button which operates system does not come and system does not work. Warning lamp lit on instrument panel and said" check B SD system" meaning the whole system doesn't work. Took to my local shop and they couldn't repair as they stated the system is a proprietary system the had no software. service bulletin #19-BE-009H was issued in 5-19 by Hyundai for this issue with car. So there is a know problem

I was going 80 mph on the interstate and suddenly my car went into limp mode and shooked really hard and dropped to 60 mph. I had to swerve to go onto the side of the road. The car behind me almost rammed into me. I contacted hampton hyundai for days to schedule an appt. I finally was able to drop off my vehicle to them but now they are telling me they have to do an oil consumption test but my car is in limp mode and it shakes when I drive it. The car is dangerous and they are trying to charge me $500 for a fuel pump replacement ( which I have a warranty of but they notified me that does not count but it matches exactly the possible reason). As you can see in the documents, they did not note that my fuel pump was broken. They just asked if I wanted to pay it so they can get started. I get normal oil changes done. They haven't even done a rod bearing test but just looked at the knock sensor and was telling me that they wanted to charge me to get that changed.

When I bought the car from Mathews in Marion Ohio the car looked like it was already in some form of accident due to a previous owner and I was unaware what caused the accident or any other problems with the vehicle upon buying. I was not presented with a carfax. I have electrical tape at the bottom of my bumper and there’s a problem with acceleration. It accelerates by itself and veers right when I take my hand off the wheel. I’m afraid to drive my car on the highway. I have complained about this problem to Mathews twice. I am now in a loaner until they figure out what’s going on.

Car does not when temperature drops below 30 degrees (Fahrenheit) even when garaged so you cannot drive car and u have to be towed several times at night. Local dealer stated unaware of issues but there is forum of Hyundai owners who have this problem with 2018 sonata. A local mechanic studied issue and did replacement on the relay switch and starter and now car starts in cold weather. It took me four years is stress and I put in complaint to Hyundai and they did nothing to compensate me for parts. This is a very big issue to be somewhere called late at night and not have reliable transportation.

Possible engine recall engine makes nose continuously stay low on oil.Bulletin came out about possible engine recall

I looked up my car on carfax and it shows a 3 different odometer readings. on 10/14/19 it had 15.125 miles. On 03/04/21 it had 61,284 miles. On 02/01/2022 it had 30,371 miles And finally on 3/3/23 it had 38,269 miles. This clearly shows that somewhere along the line, the odometer was changed. My car has been on the shop on several occasions in the less than 2 year time frame

The contact owns a 2018 Hyundai Sonata. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. The check engine warning light was illuminated. Additionally, engine oil was leaking onto the ground while the vehicle was parked. The contact stated that the dealer had previously replaced the spark plugs, and cylinders #3 and #4 twice, and an independent mechanic had replaced the front driver's side CV axle. The vehicle was towed back to the dealer, who determined that the engine had internal defects. The contact was informed that the engine and front CV axles needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure but refused to replace the engine. The failure mileage was approximately 86,800.

Lost control of the car - the car was brought in to Hyundai Maxon in Union, NJ and were told the steering column was defective and the car is not safe to be driven, needed a steering column replacement. Dropped the car off 12/12/2024 and was quoted for the replacement of the part (with a new one). On January 17, 2025—36 days after the dealership had my car—I was informed that the required part was unavailable nationally, with no ETA for availability. The fact that this critical part is unavailable at a national level raises significant concerns. Is this indicative of a broader manufacturing issue? Hyundai has provided no explanation or transparency regarding why this part cannot be sourced, further compounding my frustration as a loyal customer.

The contact owns a 2018 Hyundai Sonata. The contact stated that upon entering the vehicle, the contact became aware that the driver’s side seat belt failed to latch securely into the buckle. The seat belt warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the seat belt buckle. The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 45,000.

2018 Hyundai Sonata with only 128k miles already needs a new engine due to oil consumption. I have done the regular maintenance on the car and have only put roughly 25k miles on the car since owning it

- 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 u

When my car suddenly stopped on the highway, I encountered an issue with the “body control module.” The car wouldn’t start, and the key fob was ineffective. Additionally, the airbags stopped working. I don’t recall all the details, but I was unsure of where to report the dangerous vehicle. I’ve noticed several other Hyundai owners complaining about this issue, where their cars suddenly stop in the middle of nowhere.

The contact owns a 2018 Hyundai Sonata. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer where it was diagnosed that the engine had failed and needed to be replaced. The manufacturer was contacted and approved the engine replacement. The vehicle was repaired; however, the contact stated that the check engine warning light continued to flicker on the instrument panel. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the most recent failure The approximate failure mileage was 111,000.

See attached document for complaint.

My cars engine is failing. My safety as well as other around me are at risk because the more oil my engine consumes, the more it is likely to quite literally blow up. My car just hit 60,000 and my dealership has informed me that I need an engine replacement. The manufacturer will not take accountability for their fault engines, even though my dealership told me they see this same engine problem come in every single day. Since before my car hit 60,000 in October 2023, my oil light came on which is odd because I’ve always maintained my car well. Since then, my car has been burning 4-5 quarts of oil in 1000 miles. My engine has an oil consumption issue, as do many other Hyundai models but Hyundai refuses to acknowledge this issue. Go on Tik tok, look at how many people are having the same problem. Call a Hyundai service center, any one of your choice, they will tell you that they see oil consumption motor issues every day. Hyundai corporate told me it is not their problem, and good luck. This is unethical and immoral and there needs to be a recall. There is no reason why I need an engine replacement at 60,000 miles.

43000 miles on car. original owner. new battery. car does not cold start in the morning. all electronics light up, but engine doesn't start. This is a known issue from all the posts i found online, yet Hyundai has not issued a recall. I paid 300 for a battery 2 weeks ago and the issue didn't resolve. Now i am being told by dealer it is the starter and it's not covered because my 5 yr warranty is expired (my car is 6 years old). This is a known safety issue across the 2018 Sonata line. This should be a recall or bulletin, instead I have to come up with hundreds of dollars more to replace a starter on a car with ONLY 43,000 miles.

Approximately 6-8 weeks ago, I was driving home and my oil light began turning on and off. This had never happened before. It was nighttime and I was only a few miles from home so I continued driving. The next morning, I checked the oil to find that the reservoir was bone dry. There had been no warning light whatsoever prior to this incident. At this point, the vehicle had about 65,000 miles on it. I had to put 2 quarts of oil in before it would even register on the dipstick so I could get it to my mechanic. Upon arriving to his business, he explained that Hyundai is well aware of this ongoing issue of oil consumption but they are doing nothing about it. I had not driven excessive miles without an oil change and faithfully get it changed between 3,000-5,000 miles, which is perfectly acceptable for this vehicle. I have all receipts from these changes. I have begun to maintain a record indicating the oil that I have added over the last 1,700 miles. It has been 2.5 quarts. The morning I brought the car to my mechanic I reached out to the Hyundai dealership and was told I would need to pay for a diagnostic, then two oil consumption tests. I declined and promptly reached out to Hyundai corporate. They told me the same nonsense and then offered to have their consumer division reach out to me. Ultimately, that person told me I would need to do the same thing, so they were entirely useless in facilitating any reasonable resolution. I subsequently found out about the oil consumption p

Car is having a misfire in cylinder 4 . Carbon is being built up in my spark plugs and causing gas build up in the spark plugs . Engine burning oil fast.

The contact owns a 2018 Hyundai Sonata. The contact stated that while driving at 55 MPH, the vehicle suddenly lost motive power and was unable to accelerate above 60 MPH. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the knock sensor. The vehicle was repaired, but the failure reoccurred. The contact stated that later while driving at an undisclosed speed, the vehicle inadvertently lost all motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was towed back to the dealer, who diagnosed a failure with the connecting rod bearings. The contact was informed that metal was observed within the engine and that the engine would need to be replaced. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 21V727000 (Engine), but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA hotline for assistance. The failure mileage was 67,000.

The contact owns a 2018 Hyundai Sonata. The contact stated while driving 70 MPH, the check engine warning light illuminated, and the vehicle lost motive power. The vehicle was taken to the dealer where the dealer performed a compression check. The failure reoccurred. The vehicle was taken back to the dealer and the contact was advised to drive the vehicle until it blew up. In addition, the contact stated that all four seat belts had failed to function as intended. The contact stated that the front driver's side and passenger's side seat belts failed to retract as intended. The contact stated that the seat belts failed to secure the passengers in place. Additionally, the contact stated that the rear seat belts completely failed to retract as needed. The vehicle was not diagnosed or repaired by the independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to take the vehicle to the dealer for a combustion check and an oil consumption test to be performed out-of-pocket expense. The failure mileage was approximately 100,000.

My car is part of a campaign due to rod-bearing failure where the engine experiences problems such as complete failure, vibrating, hesitating, engine light on, and oil light on. I've been communicating with Hyundai who is not helping me with this issue. I was advised by them to continue driving the car "until the engine seizes", or I hear "a loud knocking noise". Upon inspection, three local Hyundai employees "agreed 100%" I need a new engine. However, per these employees Hyundai Corporate will not approve the replacement even though the vehicle is constantly experiencing the above symptoms above, simply because there is not a "loud knocking noise" coming from the engine. Even though ALL the other issues are present. This is very unsafe. I have a minor child I take to school daily, for an advisor to advise to drive the vehicle until "the engine seizes" is extremely dangerous, especially when they are aware my VIN is associated with engine replacement. My car exhibits symptoms of a rod-bearing failure and this multi-billion dollar company is taking advantage of hard-working urban mothers, by turning a blind eye and trying to require me to pay thousands of dollars up front for a problem THEY created by selling a vehicle with faulty engine. Again, the technicians indicated i in fact do need the engine replaced, but that Hyundai Corporate will require me to pay for a diagnostic test, rod-bearing test, and engine compression test because Corporate does not take their word for it.

The electrical and engines in these cars are horrible . The steering wheel keeps locking up while driving cause everything to flick inside the car . This is a major safety issue for me when I am driving and I am unable to control the steering wheel. Dealership claimed they don’t see the issue with the car which I am stating . The vehicle was only inspected by a mechanic and since Hyundai said they couldn’t find anything a 3rd party confirmed that this was a ongoing issue and dealership could’ve caught it but it’s cheaper the sell the car . No everything happens at once especially if I’m turning or driving under 40 mph. First appeared 15 days after I bought the vehicle I alerted the dealership immediately

The contact owns a 2013 Hyundai Sonata. The contact stated that all the rear row seat belts did not buckle as intended and water would leak from the front passenger side air conditioner. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 125,000.

The vehicle is burning oil at a high rate in a short period of time, a known issue that is affecting thousands of other people, and Hyundai refuses to issue a recall to fix this issue. If I forget to add oil every 500-1000 miles, I risk the engine locking up while driving. Their cars are dangerous to drive and are unsafe to be on the road with other drivers. They put profit over the safety of their customers.

While driving on the freeway the car would not accelerate over 45 mph and then began to lose acceleration all together. The oil and engine lights came on and we were able to pull to the shoulder. Turned the engine off and then was unable to restart. Losing power on the freeway would be considered a safety risk. The car was towed to the mechanic who checked the oil and found it was three quarts low, however, two months prior the oil had been changed along with the oilpan being replaced as it was cracked. It was then towed to the dealership and after three months of diagnostics and inspections I was told the engine needed to be replaced. The Hyundai dealership is unwilling to share any communications between them and Hyundai USA. In 2019 the ECM was updated per recall 953. The car is available for inspection at your convenience. I think it's important to note that this is a six-year-old vehicle with under 55,000 miles.

As detailed in the attached letter to Hyundai, the car has had multiple engine issues that the company refuses to resolve even though they are well aware of the on-going engine problems in Sonatas. The problem started in August 2023 and is on-going.

Car has an engine defect and consumes too much oil. Hyundai Sonata is denying the repair or engine replacement

My 2018 Hyundai sonata with only 20,821 had to have the starter replaced on [XXX] because the car would not start. I had 3 different people including AAA road service to verify why it would not start and what the problem was. I end up having my car towed with AAA to a local mechanic shop, Mike Hepler auto repair St. Cloud Florida 34769 407-593-0152, and Mike did the diagnosis saying the starter was bad it was(fried) as he put it. He said he could replace it for $492.17 for part and labor which I accepted for him to do the job. I had left numerous messages (4)for my local Hyundai dealership service department to call me to let get a diagnosis and no one has ever called me back to give them my information or ask any questions.

I am writing to file a formal complaint against Hyundai Motor America regarding a significant defect in the paint quality of my 2018 Hyundai vehicle and the company's lack of response to my attempts to resolve this issue.I am the owner of a 2018 Hyundai [Model], which I purchased from priority Hyundai in dec 2017. Over the past few months, the paint on my white Hyundai has started to peel significantly, despite regular maintenance and care. This issue has not only affected the aesthetic appeal of my vehicle but also its potential resale value. I first reported this issue to have subsequently made multiple attempts to contact Hyundai’s customer service department directly. Despite these efforts, I have received no response or acknowledgment from Hyundai regarding my concerns. This lack of communication and failure to address the defect is unacceptable and does not align with the standards expected from a reputable automobile manufacturer. The paint peeling problem is not an isolated incident, as many other owners of 2018 Hyundai white vehicles have reported similar issues. This suggests a potential defect in the paint application process or materials used, which should be addressed under the vehicle’s warranty or through a manufacturer recall.My specific complaints are as follows: 1. Hyundai has failed to acknowledge or respond to my multiple attempts to contact them about the paint peeling issue. 2. Hyundai has not offered any solution or repair for the defective paint, which

The contact owns a 2018 Hyundai Sonata. The contact stated the trunk failed to open while using the key fob and the controllers on the interior of the vehicle. The contact had taken the vehicle to the dealer where it was diagnosed that the trunk latch had failed, and the emergency cable associated with the trunk needed to be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was 44,176.

Vehicle is loosing a quart of oil every two weeks. When taken in for service no problems found. Dealership says their is a known engine problem but since I am the second owner no warrenty applies. Their suggestion is to constantly pit oil in the vehicle. This problem has effected many hyundai owners and should be on the company to fix the problem.

Engine began making knocking sound then car while in the highway was not able to accelerate. This slowdown put driver at risk for highway accident. Took car to dealership. They said the engine needed replaced then the next day said no Hyundai said it needed a sensor. This was a bandaid fix as it continued to go through oil faster than it could be changed this led to engine shake and knocking several months after the band aid fix. The car was not able to accelerate again. Again took it to Hyundai dealership said it need an oil test required us to do and pay for an oil change when we had just done one. Drive the 1000 miles brought it back failed the oil test said they need to do some sort of engine clean. Hyundai refused as the car doesn’t have oil change records for the first three years. No record of oil change was recorded even though they were completed. It being five and six years ago we don’t have receipts but believe these were part of the lease and completed at the dealership at no cost. Now Hyundai not even doing the rest of the oil test but say engine needs replaced however they will not cover the repair. We have all records after the car was purchased off the lease other car we own has full oil change records but since we are not able to locate and no one recorded they have denied the repair of a known issue with their engine. This engine issue needs a full investigation as they are trying to get away with not fixing THEIR known problem. This is a driving hazard for

The contact owned a 2018 Hyundai Sonata. The contact stated that while driving at 35 MPH, a pedestrian alerted him that the vehicle was on fire. The contact noticed that the rear portion and driver side of the vehicle was on fire. While traveling around a curve the brakes became inoperable the contact jumped out of the vehicle. he contact sustained injuries to his left shoulder and leg and medical attention was provided. There were no warning lights illuminated. The vehicle continued to roll as it was burning. The vehicle crashed into a dirt mound at the end of a hill. The fire department was on the scene to extinguish the fire. There were four gallons of fuel on the ground. The vehicle was towed to tow lot. There was no police report fire or air bag deployment. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The insurance company deemed the vehicle a total lost. The failure mileage was approximately 105, 000.

Had issues with engine consuming oil. Took to dealer who completed an engine oil consumption test to find the engine oil was 3 quarts low. All services had been completed through the dealer for the life of the vehicle. Engine replacement was approved. Vehicle was still under warranty. Vehicle was at 88227 miles when taken to dealer for repairs for oil consumption.

I was the owner of a 2018 Sonata until I was t-boned and the car was totaled. I started to make a left turn into a school parking lot when the engine kind of stalled or more like stuttered and did not go forward as usual. The oncoming car then struck me before I was completely in the driveway. My vehicle was totaled as was the other one. Fortunately no one was on the passenger's side where the other car hit me. However the seat belt did not engage which resulted in me slamming very hard into the steering column. This resulted in bruised on my right side which cleared up in several weeks, but, unfortunately, I received a heart contusion on my left side which is still causing shortness of breath. Hyundai will not acknowledge a problem with the engine or the seat belt.

Hello, I am the original owner for my 2018 Hyundai Sonata. I have now had numerous issues with this vehicle that has now left me stalled on the highway twice resulting in a near accident and the vehicle being towed twice to a dealership. I am now having issues with oil consumption with me needing to put in at least 1q per week to ensure the reading on the dipstick is above “L”. I have my vehicle serviced at the Hyundai dealership and they first brought to my attention at 90k miles that when I would go in for my scheduled oil changes the engine was nearly dry. I took my vehicle to a Midas to have it inspected for an oil leak with their mechanics twice saying there was not an oil leak. It was the mechanic here at Midas that informed me of the oil consumption issues Theta II Hyundai engines have been experiencing and to take it into the dealership to see what can be done. This has been an issue my dealership has known about, but they are refusing to assist stating the vehicle is now out of warranty at 104k miles. I have the receipts proving the vehicle has been maintained according to the manufacturers recommendation. My vehicle now will fill with the smell of burning oil when I’m driving, I’ve had the spark plugs replaced once and the new spark plugs are already coated in oil and my vehicle lurches when I’m accelerating to get onto the highway. I feel very unsafe driving this vehicle and fear it’s a matter of time before it leaves me stranded on the highway again.

The motor blew in my 2018 Hyundai sonata due to a manufacturing defect. There was a recall on it a couple of years ago. They acknowledged it was a defect which is why they put an extended warranty on the engine. Because I could not come up with maintenance records dating back until 2018 (I only had them dating back to 2020), they denied my motor and will not fix it. I bought the car brand new in 2018 and have had nothing but issues ever since. I have had to change the oil in this vehicle every 2 weeks, because it would be nothing in the oil tank at all. When the recall come out, they said they could not fix the vehicle until the motor was blown. Now that the motor has blew, they won't fix it because I don't have repair records dating back 6 years ago.

The contact owns a 2018 Hyundai Sonata. The contact stated while driving at approximately 70 MPH, the check engine warning illuminated. The contact stated that the vehicle was losing forward momentum. The contact depressed the accelerator pedal but the vehicle was still losing forward momentum and then stalled. The contact stated that he was able to coast to the side of the road. The contact attempted to restart the vehicle but was unable after several attempts. The vehicle was towed to a local dealer who diagnosed the vehicle and determined that the engine needed to be replaced due to a hole in the valve. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 120,000.

The contact owns a 2018 Hyundai Sonata. The contact stated that while attempting to start the vehicle, the vehicle failed to start. The contact stated that after several attempts, the vehicle eventually started. The failure had been persistent since December 2022. The vehicle was taken to the dealer; however, the vehicle was not diagnosed. The contact was requested to pay a diagnostic fee. The contact declined to pay the diagnostic fee because the vehicle was under warranty at the time. The contact purchased a new battery, and the battery was replaced; however, the failure reoccurred. In addition, the check engine warning light illuminated. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and a case was filed. The failure mileage was unknown.

I had just taken my 2018 Hyundai Sonata through the brushless car wash at Marion Ford-Hyundai in Marion, Illinois. As I exited the car wash, I noticed that the engine light had come on. When I took the car out on the highway, it accelerated very slowly and would only reach a speed of about 50 miles per hour. I called the service department at the dealership about what had happened and they told me the knock sensor had shorted out and for safety to the engine, would only allow me to go about 50 miles per hour, and to drive it as little as possible until it was repaired. They said that they had several other Sonatas in the shop with the exact same problem. The car was, and still is, under warranty, so it was repaired for free. It took about a month for them to get to my car, due in part to the other Sonatas waiting for the same problem to be repaired. The second time it happened I was driving home and went through some water on the highway at about 55 miles per hour, and the engine light came on and the car instantly decelerated to about 45 miles per hour. Same problem. The dealer again repaired the car for free. My two biggest concerns are how much it's going to cost me to have the repair done after the car's warranty expires, and, more importantly, what if the problem occurs in fast city traffic, such as in Covington, KY, where you have to drive 80 mph to keep from being a traffic hazard, or some other similar situation, such as interstate highway travel. Rapid deceleration i