Engine ceases and all the lights on the dash board flash and stay on and the car stalls. This happened for the 5th time yesterday on rt 78. I almost coursed a collusion because my car lost power and stalled on the highway. I managed to move over to the shoulder as quick I could. After a few minutes later the engine started. This happens both when the car is parked and in motion. This is very dangerous. Have taken the car back to the dealership and they say they fixed the problem but it keeps happening. I have google this problem and found other owners experiencing the same problem. I think the should have a recall for this engine to get it fixed.

- Easton, PA, USA

I purchased a new 2015 Hyundai Sonata 8 mos ago and two days ago while driving on a local highway I heard a loud knocking sound while accelerating. Yesterday I took it to the Hyundai dealer service ctr where I purchased the vehicle and I was told that I need a new engine due to there being metal shavings in the motor.

- Dayton, NJ, USA

While driving and turning onto an intersection the car's engine quietly turned off leaving me in the middle of oncoming traffic. I pressed the gas pedal but no reaction. I had to put the car on park and turn the key off and attempt to restart the car. This worked for now. The car has only 6664 miles on it. I have had the car for only 6 months. No pending maintenance is due for this to have happened. There are also no pending recalls due. So this is obviously a very dangerous situation and common among others on the complaint board.

- Hialeah, FL, USA

While driving on a highway, the car unexpectedly lost engine power; the car engine did not respond whenever I quickly stepped on the gas pedal; thereby making any quick defensive maneuver impossible. It's as if the car engine was starved for air and became unresponsive for quick acceleration. Dealership determined error code P2600, intake runner control problem. Due to this problem of impaired acceleration getting, on and off major highways was particularly dangerous since quick power was non-existent and avoiding other cars quickly was not possible. Truly a safety issue!

- Havertown, PA, USA

The contact owns a 2015 Hyundai Sonata. While driving 65 mph, the vehicle began to decelerate as if the brakes were being applied. The contact was depressing the accelerator pedal with no response. The vehicle was taken to a dealer where it was diagnosed that the diagnostic trouble code tech line needed to be replaced. The failure occurred previously. The vehicle was being repaired. The manufacturer was made aware of the failure. The failure mileage was 11,000.

- Chatsworth, CA, USA

I bought a 2015 Hyundai Sonata eco on Aug 30, 2015 and shortly after purchase low tire pressure light and display came on while driving 65 mph indicating that the rear drive wheel was at 9psi. I pulled over on the side of the road and inspected tire and the tire had a normal feel. Drove for 10 mins and tire pressure went back up to 35 psi. On 11/15 the battery and oil light came on while the vehicle was in drive and immediately following the lights the engine shut off. I sat in the middle of the road and had to restart my vehicle and then drove it to the dealership. The dealership says, "2691 performed all system fault code search and tsb search. No fault codes stored at this time and no related tsbs for customer concern as described." The dealership later found a warning saying to reprogram the sensor and reprogrammed the sensor as the "fix". I opened a case with Hyundai and the results of the case was to obtain a print out of the error codes (which is showing none) and to file a complaint with the BBB if I wasn't satisfied with the outcome. I am concerned that my vehicle is not properly recording issues that my vehicle encounters like my engine shutting off. The mechanics at the dealership said that error codes are thrown usually when the sensors go bad. I am concerned for my safety in a vehicle that Hyundai will not fix solely because there are no error codes on file. I believe that the error codes that should be in this report to show the engine shutting off are not being recorded properly. Hyundai will not do anything to investigate my issue unless they see a code so until a code is thrown and recorded properly I am left with a vehicle that is unsafe and is not performing correctly.

- Fredericksburg, VA, USA

I bought this new car a few months ago. At 1089 miles engine overheated while in traffic. I manage to stop safely and I called roadside to tow the car to service. Second day they told me that they need to replace the engine according to Hyundai tech line. This for me was a red flag that something is really wrong with that car. They found coolant inside the engine and this was their diagnosis, jsut like this. The replaced the engine with a remanufactured one and few weeks later I ended up in service again for coolant leaks. They replaced 2 big houses. Not long after this I ended up again in service cause coolant level is low on the overfill compartment. They said is nothing wrong and all the tests are good. So I took the car and a couple of weeks later the same. They told me the same story. Well the car overheated again and again and again till everything started to smell like something melted and some kind of smoke came out from inside the engine when you open the oil cap. The car has been in service for more than 3 weeks with no resolution so far. I reported coolant issues from the beginning but Hyundai refuse to listed and kept saying is nothing wrong. I consider this S huge issues and can cause the car to get on fire or engine to explode. I hope to get this done under lemon law but Hyundai is stubborn and we might end up in court. In the mean time I am paying for the 7 months for a defective problem not to mention the value after all these major issues.

- San Antonio, TX, USA

The contact owns a 2015 Hyundai Sonata. The contact stated that when the brake pedal was depressed, the vehicle accelerated. In addition, the vehicle would not move when the accelerator pedal was depressed. The vehicle was not repaired. The manufacturer was not made aware of the issue. The failure mileage was 25,000.

- Canton, GA, USA

On August 18, 2015 I was siting at a stop light and my car just shut off, I waited a few seconds and it started back up again, I took it to cocoa Hyundai they ran every test called me and told me that they could not find nothing wrong with my vehicle. On September 21 I was driving home from work my car just died it started jerking and the engine light and skid light came on I waited and it restarted it moved maybe about an inch or so and shut down again, I pulled to the side of the road and let it sit and it restarted I proceed to take it to cocoa Hyundai and told them that this is the (2) second time I have had this problem they kept the car ran every test called the Hyundai tech and they proceeded to inform me that they could not find anything wrong with this car. So I said of I guess this is normal for a 2015 to do this, I am in fear of driving this vehicle because I'm not sure when or where it will shut down. Something is seriously wrong with this vehicle and it is putting my life in danger...

- Rockledge, FL, USA

This Hyundai sonota has a push button ignition. Once the engine is started, a person can leave the vehicle with the key fob in their pocket and the engine stays running and will not shut off. This is in violation of Federal Motor Vehicle Safety Standard 114. Once the key is removed from the vehicle the engine should shut off. This engine is so quiet you cannot even hear it running while in the vehicle and if someone is partially color blind you can barely see the red and green indicator. This engine will run in an idle state no matter where the key causing risk of fire, carbon monoxide poisining and death and injury to anyone near this vehicle if left running and since the car stays running once it is started anyone can walk away with the key fob in their pocket and the car stays running no matter what. There are no reminders when exiting the vehicle that the engine is running, there is no automatic shut off in the vehicle, there are no reminders in the vehicle that the engine is running. The push button starts are not only a safety threat but also can be hazard in a parking garage if the engine catches fire due to over heating it can affect all the other vehicles in a parking garage and cause even worse damage.

- Mayfield Heights , OH, USA

At 11:38 am, car suddenly lost power while in middle of intersection, all the symbols on the dashboard lit up, pushing on throttle had absolutely no effect on cars movement. Car would go forward at idle speed only. Received a message on navigation screen and an email saying ?a possible condition with your engine control system has been detected. Hyundai recommends a full system check soon. To schedule an appointment with a Hyundai dealer, say service link when asked to say the name of a service. Pulled to side of road, turned off engine. Restarted engine, only check engine light was on, but acceleration still rough.

- Poway, CA, USA

The contact owns a 2015 Hyundai Sonata. While driving at various speeds, the vehicle suddenly shut off. The vehicle was towed to the dealer who was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 3,000.

- Laplata, MD, USA

The contact owns a 2015 Hyundai Sonata. While driving approximately 35 mph, the vehicle made a very loud sound and stalled. There were no warning indicators illuminated. The contact was able to restart the vehicle and had it towed to the dealer for diagnostic testing. The vehicle was not repaired. The manufacturer was not notified. The approximate failure mileage was 600.

- Boco Roton, FL, USA

2015 Hyundai Sonata 2T - slow acceleration; car will continue to move when foot on break; loud engine noise; engine light always on. Took car to dealer they said it was a recall issue that they repaired. Drove car two days engine light came back on. Now dealer states they are waiting for parts to come in to fix.

- Hammond, IN, USA

I have the limited edition, 2.0L turbocharged. When the engine is cold, and if you tip-in aggressively, you can hear some screeching sound above 5000 RPM of the engine, easily achieved in second or third gear. The turbo is designed by Mitsubishi and I knew someone who works there. After listening the sound, he indicated it is a case of turbocharger imbalance. I am not sure if it a design issue or mine is just a one off case. I have contacted Hyundai last week, haven't gotten any response yet. I believe the turbo has to be replaced. If it not resolved, over a period of time due to excessive vibration, the journal bearing may fail and the turbo could blast. If anyone has the same issue, please take it seriously.

- Rochester Hills, MI, USA

On 04/06/2016, the vehicle's engine began to run rough and hesitated. Lack of acceleration, even at 4000 rpms (top speed 20 mph at 4000 rpms). The vehicle began to stall and required the gas pedal to be pressed due to low rpms at idle. The problem is intermittent, with no warning to the operator, and poses a significant safety risk on roadways with speed limits above 40 mph. No engine warning light came on to warn the operator. After three occurrences of this problem, in less than 24 hours, the vehicle, with only 1,351 miles on the odometer, was taken to dealership for service on 4/7/2015. After replacing, the fuel pump, the vehicle was returned to the owner on 04/10/2015. Less than 2 miles after picking the vehicle up from service, the problem occurred again, on a 50 mph roadway. The operator was very concerned for her safety as other motorists were swerving around the vehicle and honking their horns. Again, no engine warning lights came on to warn the operator. Once again, the vehicle was taken back to the dealership within 20 minutes of initial pick-up, for further repairs. The dealership has had the vehicle ever since, changing multiple parts dealing wit the fuel systems, and has yet to correct the problem to date (04/16/2015).

- Bel Air, MD, USA

This is the second 2015 Hyundai Sonata which had computer problems. The first one purchased in July 2014, Hyundai took it back in Dec 2014 because of the computer problems. The second picked up in Dec 2014 currently has approximately 2900miles with the same basic computer issues. Both vehicles when traveling from about 40 to 65mph the engine's computer system would cut the speed down and lose compression to approximately 20mph to protect the vehicle from some kind of engine damage. You would be forced to get off the road and shut the vehicle off. Once the engine was off 5 minutes the engine would start up, the check engine/anti skid lights would stay on so that the dealership could see what codes were causing the problem. The first vehicle was assigned a case# by Hyundai -case# 6788232 and was finally taken back by Hyundai in Dec 2014 after being out of service for well over 35 days due to the continued computer problems. The replacement vehicle recently had 3 incidents while traveling at approx. 65mph the engine would go to 20mph without warning. The only exception was that when I restarted the vehicle the check engine light would remain on until I turned off the vehicle. When I restarted the vehicle the check engine light went off leaving me in a difficult position when bringing the vehicle in for service, the computer didn't store the event to verify the problem. The dealer said if it occurs again to let them know and they would contact their technical hotline. The service dept knows there is a problem since they went through this with me on the first vehicle, that's why they took the vehicle back. I established a new case file [xxx] on 4/16/2015 with Hyundai Consumer Affairs. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Wallington, NJ, USA

At 1540 miles 2015 Hyundai Sonata limited engine cam advance sensor failed. This caused engine running rough and limited power with inability to climb hills without constantly downshifting. Highway driving is dangerous due to inability to accelerate and merge and loss of power on hills. Other owners are unable to start their cars altogether. Engine monitor warned of problem and recommended full systems diagnostic which pointed to cam sensor issue. Supply of sensors was backlogged due to multiple failures nationally. This is also evidenced by the number of online owner complaints for the same issue many stating long delays in obtaining the part and multiple part failures. In my case, after 200 miles with the new sensor if failed a second time and I am again waiting for parts. The vehicle now has 1700 miles on it since new. For a new vehicle this is a totally unacceptable level of quality. While I was told the O-ring seal fails causing oil to saturate the sensor I personally believe they do not know the full reason for the failures, I.e. poor sensor manufacturing, materials issue, O-ring issue etc. In speaking with Hyundai corporate personnel it became obvious to me that they are trying to avoid a national recall by understating the scope of this problem nationally and trying to minimalize the extent of the problem in our conversations. I suggest an investigation to determine the extent of the issue and see if it warrants a recall. For other owners or potential buyers, while this failure has been my primary complaint I have noted other issues with the electronic warning sensor inconsistency and cabin electronics systems which have not been resolved. This my first experience with owning a Hyundai and I am terribly disappointed. Next step is lemon law filing.

- Bethlehem, PA, USA

The contact owns a 2015 Hyundai Sonata. While traveling on a roadway or a highway, the vehicle's speed would reduce without warning. The vehicle became slow to respond when the accelerator pedal was depressed. The vehicle was taken to an authorized dealer more than five times, but they could not replicate and diagnose the failure. The vehicle was taken to a second authorized dealer who diagnosed that the throttle body needed to be replaced. The vehicle was repaired and the failure recurred. The vehicle was not repaired. The vehicle was taken back to the authorized dealer for further inspection and diagnosis. The manufacturer was notified of the failure. The VIN was invalid. The approximate failure mileage was 500.

- Las Vegas, NV, USA

I purchased my Hyundai Sonata on 1/05/2015 with only 6 miles from sheehy Hyundai of waldor in Maryland after 11 days of purchase on January 16 2015 at approximately 5:45 pm (rush hour in the DC metro area) my Sonata came to an abrupt stop without any warning signs on the highway in middle lane which is very dangerous and very scary and put me in a very vulnerable position. The engine shut off, I was unable to steer out the way of traffic and the brakes locked up and I was unable to do anything while in the middle of the rush hour traffic. I was a sitting duck waiting to get smashed by a pickup truck directly in the back of me.thank my god nothing happened. I was unable to use the sos and bluelink emergency features that is equipped came with 3 months free activation in this vehicle. I had to personally call via my cell phone and await police assistance which was 10 minutes still in the middle of the highway and after the assistance of the police we were only then able to push the vehicle to the shoulder of the highway. The bluelink customer service did very poorly in responding after all this emergency situation and to make it worse they did not provide a tow until 1.45 minutes after, then commence to justify this long period by stating its "Friday and the normal time is 2 hours or more". therefore, I am pleading to sheehy dealership and Hyundai corporation along with anyone else that can assist me to ensure that I have a new replacement vehicle. I am getting nowhere with sheehy dealership in reference to a new replacement vehicle. The vehicle is currently at sheehy service department and they are still not able to figure out the problem. Even though they might be able to fix the vehicle I will not feel safe driving the same vehicle after this very hazardous incident.

- La Plata, MD, USA