Theta II 4 cylinder 2,4L engine 2015 Hyundai Sonata sport. Car started shaking and then stalled in the middle of a city street. This could have been on the freeway and caused a crash. The car smelt like something was burning, I had it towed to momentum Hyundai fairfield, ca. They are saying nothing is wrong with the car.

- Suisun City, CA, USA

Bought this car brand new and at 20,000 miles it all started to go down hill. My car shakes & stalls hesitates bad loss of power almost causing accidents on a daily basis. I have brought it to the dealer 5 times for the same complaint even left it there for 9 days still not fixed I have a $398 payment for a car I am afraid to drive. I will not put my children in the car I am that afraid of getting in an accident. Hyundai does nothing no one can fix it & everyone has the same complaint I do all over the internet. These cars need to be taken off the road before someone gets killed!!! I pay for a car that I keep parked thats insane!!! my car is unsafe and a road hazard and no one is doing anything for any of these people that have the same problem as me. I have even brought video footage to Hyundai and they just update my computers which makes is worse half the time.

- Salisbury, NC, USA

The contact owns a 2015 Hyundai Sonata. While driving approximately 5 mph approaching a stop light, the vehicle suddenly began to emit a grinding noise from the front end and began to shake. The vehicle stalled. The contact was able to restart the vehicle; however, because it began to hesitate, the contact pulled the vehicle off the road and turned off the engine. The vehicle was towed to Hyundai of chantilly Virginia (14848 stonecroft center ct, chantilly, va 20151; 703-480-9000), but the cause of the failure could not be determined. The vehicle had not been diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 20,000.

- Haymarket, VA, USA

I was told I need a need engine because of sludge indicating that I hadn't had regular oil changes. The car is two years old and I've had five oil changes. They won't pay for the engine but I've seen that this is an on going problem for these cars. Not my car is smoking even worst. They did three of the oil changes and another company that's now out of business did the others and I can't prove it because it was independently owned...there is no way to check the records.they completed an oil consumption test because we were losing oil. The car didn't start smoking until June 2017. We had been complaining since we had the car because it always seemed at this it didn't have any get up and go. They said that was because there are three different car modes; economy (which we always drive in), normal and sport. We never believed that. A police stopped my husband yesterday and said we can't drive the car with all that smoke pouring out the back. What am I to do? the car is only two years old! it had a little over 4K miles when we first purchased it. They said an oil change was completed prior to us purchasing the car. We never had any warning light that our oil was low.

- Cleveland, OH, USA

I drove 200 miles from my home to charlevoix, Michigan. While driving I noticed that the engine was making a 'whooshing sound' every time I accelerated. This happened at highway speeds and at normal city driving speeds. Rather than drive the car home, I took it to the closest dealership some 60 miles away and reported the problem. Car has a 2.0turbo engine. The inlet duct that brings air into the turbo severed at the point of attachment to the turbo. The technician at the dealer said that he could not tell if the duct melted or was cut. Other than oil changes, the car has never required engine service. He deemed the car unsafe to drive off the lot., he said in his write up that any object could find its way into the turbo because the duct is unattached. This would lead to total engine failure, and hazardous driving condition. The car has been at the dealership since Friday, october13,2017. I received notification from the dealer today that the replacement part is on national back order and that they have been told by Hyundai that there is no promised delivery date since no parts are in stock I suspect that there may be other customers who reported the same problem which would be causing the stock-out situation.

- Bloomfield Hills, MI, USA

Problems started with rattling noise from engine, and engine loosing power/surging. This was 2 years ago with 20,000 miles on car, and took to dealer who applied ECM update. Which if anything made it worse, and car started surging forward in situations like applying brakes when approaching red light. This has caused me to nearly rear end several cars, and pushed me out in traffic when engine surges unexpectedly. I have made several trips to the dealership, like many others always get the same answer 'we were unable to reproduce issue', and even went to another dealership to receive same answer. Car still has same problem, it happens frequently, and also happens when I have had friends with me or drive the car. So I'm not crazy, not doing anything wrong, and believe hyaundai is trying to wait for power train warranty to expire. Since I travel for work and now have 94,000 miles on the 2015 Sonata sport.

- Montrose, MO, USA

Purchased 2015 Sonata for son. Sonata started stalling out at low RPM, idling very rough. When it unexpectedly stalls out, very dangerous to brake, steer. Took it to 2 Hyundai dealers, both said car needs engine replaced, neither could tell me exactly why. Said engine is all gunky. First dealer said it was due to metal shavings in oil. Second dealer tried to blame us for poor maintenance, even though we have service records. Car has 80,000 miles. Paid $19,382 16 months ago, $5800 remains on loan and car is worthless. $8000 to replace engine. I am 2nd owner. Purchase from enterprise car sales, with 60,000 mile warranty. Also purchased extended warranty, but at 80,000 miles, we are over. I have owned 4 Camry and 2 Accord in my life. All have run and been sold at around 200,000 miles. Big mistake to trust Hyundai. Many recalls on Sonata engines 2011-14, but no engine recall on 2015...yet.

- Cedar Glen, CA, USA

Poor mpg only getting 17 mpg on the car when I should be getting 25 to 27 was getting 14 till I got the new up dat in August go 2017, car has now 10,000 miles on it will be 2 year old at the end of November, deal say there nothing wrong been in 3 times, told me unless cooperate comes up with fix live with it, an there been a vibration in the steering wheel an drive seat since we owned the car all in told is that characteristic of the car, not to bother to bring bring back any more

- New Hyde Park, NY, USA

While driving on a main road in my city I accelerated and heard a banging noise in my engine, when I accelerated the noise got louder. Finally, the noise stopped and as I noticed the noise gone I also noticed I could no longer hear my engine. I tried to accelerate and my speedometer was completely frozen with the oil light, engine light, and battery light on. I was able to coast to a residential area where my car was picked up and towed. Fast forward a few days and Hyundai is now claiming that the engine failure is due to neglect as now they are requiring all maintenance records for my vehicle or my warranty is null. If I can't get my whole maintenance history then I was told that will be a real problem and my service may be denied! mind you, 2014 Sonatas were recalled due to their engine but I was assured the 2015 Sonatas have a different engine, different part. Please do your research and do not buy a Hyundai, they do not stand by their work.

- Lancaster, CA, USA

Engine performance was reduced; a knocking sound could be heard from the left side of the engine; within a few days the engine stalled while driving and would not restart. Hyundai dealer inspection indicates the engine is seized up. Symptoms are similar to those in engine-recalled Hyundai Sonatas from the previous model year. Hyundai declines to pay to replace the engine, but I suspect this is the same problem as occurred in previous model year, for which Hyundai is replacing engines.

- Sacramento, CA, USA

The contact owns a 2015 Hyundai Sonata. While driving 10 mph, the vehicle shook and stalled without warning. The vehicle was taken to a local dealer (Hyundai village, 24 commonwealth ave danvers, MA 01923), but was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was 15,000.

- Melrose, MA, USA

The contact owns a 2015 Hyundai Sonata. When the contact inserted the key into the ignition, the vehicle failed to start without warning. The vehicle was towed three times to the contact's residence. The local dealer was not contacted. The manufacturer was not notified of the issue. The VIN was unknown. The failure mileage was 57,641.

- Jacksonville, FL, USA

Air intake hose from the air filter box to the turbocharger inlet - 2.0 turbo engine - melted and broke. Reduced power and potentially foreign debris can enter the turbocharger and damage it, reducing power even further. Apparently many owners with the 2.0 turbo engine have experienced the same issue. I went to the local dealership this morning and they told me it could be a month before the back ordered part arrives. I was not offered alternative transportation.

- Mansfield, TX, USA

My engine suddenly stalled while driving down a busy highway with my family. Luckily no one was hurt thank the lord! we were driving down the highway when we started to hear a knocking noise and the car started to decelerate. We noticed there was white smoke as well. I was able to get the car to the shoulder of the highway. The car would not restart so we called roadside assistance and since it was Saturday evening, (after hours) we had park the car at a nearby walmart until Monday. I had to do the whole roadside assistance song and dance all over again Monday. The service department was very accommodating. They were pleasant and even provided a loaner car. They informed me the engine would need to be replaced but since my car only had 34,000 miles it should be covered. They said they just had to get it approved by Hyundai first. After a week of waiting they called me up an told me Hyundai would not be covering the vehicle due lack of maintenance (sighted oil crude build up as evidence) and I would need to fork over $5500. I got the oil changed and maintained the car but failed to keep documentation. Upon researching the issue, it appears Hyundai has a history of not standing by their warranty and leaving their customers high and dry. In fact they just settled a law suit for the same exact thing. So we paid up, waited a week for the repairs and now I'm back up here a week later with another engine problem (overheating). Luckily we only had the car for a week because they likely would've charged me again. Well hopefully they will provide me with a loaner again because this just destroyed my work schedule for today.

- Spring, TX, USA

While driving my car loses power. What causes this is a leaking manifold. My friend has a 2015 Sonata with the same issue.

- Brooklyn, NY, USA

The contact owns a 2015 Hyundai Sonata. While driving various speeds, there was a knocking noise coming from the transmission and the check engine indicator illuminated. The vehicle was taken to long island city Hyundai in queens, NY who stated that the vehicle was out of warranty and could not be serviced. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The approximate failure mileage was 99,988.

- Bronx, NY, USA

The engine broke down wile driving on the street. Mechanic is changing the engine.

- Los Angeles, CA, USA

The contact owns a 2015 Hyundai Sonata. While making a left turn, the rpms would increase and then idle. When shifting into drive, the motor would jerk violently. Finally, when driving and depressing the brake pedal to come to a stop, the brake pedal seized. The contact had to apply excessive force to bring the vehicle to a complete stop. The vehicle was taken to the crain Hyundai dealer (located in North little rock, ar) where it was diagnosed that metal shavings were found in the motor and the engine needed to be replaced. The vehicle was not repaired due to the repair fees. The VIN was included in NHTSA campaign number: 17V359000 (parking brake). The manufacturer was notified of the failure and informed the contact that the vehicle warranty had expired. No further assistance was offered. The approximate failure mileage was 84,000.

- North Little Rock, AR, USA

The contact owns a 2015 Hyundai Sonata. While driving various slow speeds, the vehicle stalled without warning. The contact stated that the vehicle stalled after making a right turn, usually directly after stopping at a stop sign. Rancho grande motors of san luis obispo, California was made aware of the issue, but could not duplicate the failure. The vehicle was not repaired. The manufacturer was made aware of the issue. The failure mileage was approximately 18,000.

- Atascadero, CA, USA

The contact owns a 2015 Hyundai Sonata. While driving 35 mph, the engine stalled without warning. The contact pulled over to the side of the road. The contact noticed that the fuel in the engine oil was empty. The contact refilled the oil. The vehicle was restarted and returned to normal. The contact also stated that there was no oil leak. The vehicle was taken to the dealer (first lube usa located at 3614 w Lincoln ave, milwaukee, wi 53215; (414) 647-8820) where an oil flush was performed and the oil was refilled. The vehicle was not diagnosed. The manufacturer was not contacted. The approximate failure mileage was 58,000.

- West Allis, WI, USA