My 2013 Hyundai Sonata just suddenly and completely died. About 3-4 days prior it had started making a knocking sound and would blow puffs of smoke from the exhaust on cranking and heavy acceleration. This all started right after my husband changed the oil. I got in the car to take my kids to school and while going down the road at 60 mph down a rural road, it completely cut off. I coasted off of the road, waited a few seconds, and cranked the car. It acted fine, but the knocking was definitely still there. After my husband got home from work he was going to check the car out and see if he could figure out what was wrong. He decided to drive the car down the road, and the next thing I know, I am getting a phone call from him asking me to come pick him up. The engine had locked up (seized) and the car had just died while going down the road. Completely died, wouldn't do anything and we had to call a tow truck to come get it and take it to a mechanic's shop, which is where it still is. This car only has 35,000 miles on it and I have never seen any kind of indicator light come on signalling that there is anything wrong with the car. Nothing! not the oil light, nothing! I have read so very many forums and complaints that sound exactly like my situation. It all seems very shady to me. It cannot be a coincidence that the same exact thing has happened to so many.

- Locust, NC, USA

While driving aprox 30 mph engine stalled.

- Port Richey, FL, USA

The engine failed while I was driving. No warning, no engine light, just a knock. Hyundai is refusing to honor the warranty on this leased vehicle. No loaner car, no rental reimbursement as promised. They claimed I neglected it, even after I produced a folder of maintenance receipts. They gave the BBB arbitrator pictures of a crappy engine and an old oil filter they said was mine. I told the arbitrator about the investigations and lawsuits for the very same issue as mine. I said the engine had a defect and they denied it to the arbitrator. (they knew) now I have no car (I am disabled) and I still must pay monthly lease fee (ends 2016) and the very comprehensive insurance I am required to maintain. So I cannot afford a car and if I replace the engine (5-7 thousand) I am returning it in Nov. 2016 anyway. I told the BBB auto line that I read about Hyundai engines seizing in record numbers back in July. Nobody bothered to check it out and I lost. The nys attorney general eric schneiderman has investigated the Hyundai dealer that pulled this for dishonest practices with consumers.

- Long Beach, NY, USA

The contact owns a 2013 Hyundai Sonata. While driving up a hill at 50 mph, the vehicle experienced a slight hesitation and an abnormal noise while being accelerated. The contact pulled the vehicle over and observed a lot of smoke coming from the rear of the vehicle. The vehicle was taken to a dealer where it was diagnosed that engine needed to be replaced. The manufacturer was made aware of the failure. The failure mileage was approximately 38,000.

- Cumberland , ME, USA

On May 29, 2015 I was pulling out from a side road onto a main highway when all of a sudden the car completely lost power and all the lights were flashing, then the engine just stopped. The brakes even went to the floor. Thankfully there were no cars coming down the main highway and I was able to get the car to the side of the road. Called a tow truck and had it towed to the Hyundai dealer in chattanooga, tn. The service guy named andy tried to convince me that my oil was low causing the engine to lock up, stating the oil looked like sludge! we were unable to present every single piece of maintenance record, so we were told our warranty was void. The oil had just been changed in April and there was absolutely no reason for the engine to lock up or "look like sludge"!. the dealership wanted almost $6000 to replace the motor (we don't have that kind of money accessible). When we argued about the warranty, the service department asked us to pay $675 to tear the engine down. "if" they found a defect in the motor, it still might not be covered!! needless to say, the car was towed to my brothers home and still sets there today all the while we are still making the monthly payment and full coverage insurance on a 2-year old car that we can't drive!!

- Trenton, GA, USA

The engine was sputtering and then just quit. Got it restarted long enough to get out of the roadway. Took to dealership where it was purchased. They stated there was no oil and that a new engine was needed. The oil light never came on and the temp gauge did not show the engine was running hot or anything. It just stopped running.

- Manassas, VA, USA

I was driving on the interstate at 65mph and my engine seized without warning. I drifted off of the road and contacted Hyundai roadside assistance. The car was towed to the dealership. After 3 business days of not getting any answers on the problem from the dealership they finally called me and said the engine had "sludge" and needed to be replaced. The car is a 2013 that I purchased in 10/2012 and had 45,000 miles at the time of this incident. I was informed that there was nothing else that could be done and the warranty was declined due to lack of maintenance (oil changes). I just had my oil changed the same day that this happened. I was told by the dealership that there was nothing else they could do and a used engine would cost $4,000+. I declined the service. The customer service at both Hyundai and the dealership is awful. My car is still at the dealership. This is a serious safety issue that needs to be addressed.

- Carmichaels, PA, USA

My car revved to between 4 and 6 thousand rpms when I was parking in my work parking garage. In the process I ended up hitting two SUVS and did over $5,500 in damage to my car. I took my car to our Hyundai service to have the engine looked at and they couldn't find anything wrong with it. On Friday, May 15 as I was driving home from work on rt 70 at the top of braddock mountain my car revved again for no reason. Luckily I wasn't in traffic when the rev happened. This rev has also happened when my husband was driving the car.

- Hagerstown, MD, USA

The contact owns a 2013 Hyundai Sonata. While driving 55 mph, the vehicle stalled without warning. The vehicle was towed to a dealer where it was diagnosed that the motor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The VIN was not available. The failure mileage was 50,062.

- Louisville, KY, USA

Driving down the freeway, we heard a clicking sound then a loss of power, but it came back after a few seconds. The clicking and loss of power happened again the next day while driving on a surface street, again for just a few seconds. The next thing that happened while accelerating onto the freeway, a red light flashed on the instrument panel, but did not stay on, unable to determine the light at that time. The next thing that happened was a puff of smoke came out of the tail pipe, which at that time we decided to take the vehicle to the dealer. The next day, the dealer informed me that the vehicle had no oil in the engine, and that it had goop in the oil pan. The dealer then said that the rings are burnt up and that the engine needed to be replaced. We had no warning that the engine had no oil - no warning lights stayed on. We also have a bluelink report that says everything is operating as normal.

- Humble, TX, USA

I was driving on road (around 45 mph) and the car stalled and stopped abruptly. Managed to safely pull over the vehicle to the side of the road when I realized the car started to lose power in spite of me trying to accelerate and keep it going. Seconds before car stalled, check engine, oil, eps and battery indicators lighted on. Towed the car to the dealership and they had the car for a week, checked and assured us the car was fine to drive but the incident occurred again while I was driving (around 45 mph) to office on 14 April 2015 and the car odometer reading was showing18385. Same as before check engine, oil, eps and battery indicators lighted on and car stopped abruptly. Would have been life threatening if it would have happened like 10 minutes earlier as I was driving on the highway. This time the car was towed to the dealership again, and was later told that the engine is faulty and needs to be replaced with a brand new engine. Car is still in the dealership.

- Vernon Hills, IL, USA

In rain car looses power. Wants to cut off.

- Tamarac, FL, USA

I was pulling up to a stop light and my car made a jerking motion, as it had did one day prior as well. I looked at my dash and the eps light, battery light, check engine light, and one more light came on. I tried to drive the car forward and it began to roll back. I turned the car off to try and restart it, but the break would not push down for me to turn it back on. The car was towed to a dealership where I showed two service technicians the photo of the dashboard that I took, and both said that my engine had cut off. They kept the car overnight and drove on it to try and recreate the problem, along with running multiple tests, and nothing showed up.

- Atlanta, GA, USA

The transmission slips.

- The Villages, FL, USA

I was turning on to smith switch road in ashburn Virginia from waxpool road. I reached to turn on the emergency flashers due to bicyclist on the roadway and I bumped the starter switch for the car and it shut the car off while it was still in motion. This caused the steering to be heavy and brakes very hard to use. Luckily I was able to coast off the road without an accident. I had to stop the vehicle totally and put back into park before it would start again and it would not start again while it was coasting. I tried and it didn't work.

- Woodbridge, VA, USA

Have the 2013 Hyundai Sonata turbo and was told when I bought it that it would appear to drive differently. It races before it shifts to the next gear and at times it seems to pick up speed when I am not on the gas. Have called and asked to be told that the RPM system has to get as high as 4 before it shifts - that doesn't seem right and it makes the steering difficult at times. The acceleration is poor and I only have 11,000 miles on it but I'm ready to trade it in - not sure if a turbo is suppose to really drive this way and can't seem to get an answer from the dealer when I call. Their service hours are not good because they're open while I work. Does anyone else have this problem?

- Selden, NY, USA

The contact owns a 2013 Hyundai Sonata. The contact stated that while braking to a complete stop, the engine rpms increased to 6000 as the contact repeatedly applied the brakes to stop the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 7,600. Updated 3/28/14 updated 04/22/14

- Sumter , SC, USA

When braking, the car self-accelerates. There is no predicting when this will happen- sometimes it does, sometimes it doesn't. this has occurred approximately twenty times when I have started/stopped the car while parking and also once on a busy highway when I was unable to stop for a red light. When this happens, my foot is on the brake, but the car accelerates. The car has been to the ciocca Hyundai dealer in quakertown, pa three times. They've kept it as long as three days. They tried to duplicate the problem and I was told it did not occur. They've told me that they've never heard of a problem like this. They checked out the car and told me that nothing is wrong. The problem has been reported to Hyundai- regional case #6004610 and case #6342874. After filing there's nothing that can be done besides file the report with the regional representative. I've been fortunate that no one has been injured so far. My family members will not ride in the car with me. The car currently has 5,700 miles on it. It is a killer car- an accident waiting to happen.

- Springtown, PA, USA

First occurrence I was sitting at a stop light and started to move, car lunged forward with an unattended acceleration. Second occurrence I was at an intersection waiting to proceed through, stepped on the gas pedal and car did not accelerate. Third occurrence was in Kansas and my brother was driving. It surged again and we both noticed it. Fourth occurrence resulted in an accident in ringgold ga on 10-28-13. I was starting to park in front of the church, the car surged fast and I tried to stop it with my brake, but it continued into the concrete building resulting in my serious injury and $6,000 damage to my car. With great concern about this car, I went to the dealer and asked if they had ever heard of this before and they said, "no".

- Buford, GA, USA

The contact owns a 2013 Hyundai Sonata. The contact stated that the vehicle ignited into flames while parked and unoccupied. The fire department extinguished the fire. An independent investigator stated the fire originated in the engine compartment. The vehicle was completely destroyed and towed to an authorized dealer. The manufacturer was notified of the problem. The approximate failure mileage was 18,000.

- Phoenix, AZ, USA