While attempting to accelerate from a stop the vehicle got to 30 to 35 mph and would not go any faster despite pressing gas pedal and rpms went up to 7 and 8. after pushing gas pedal several times the car will finally increase in speed which is very concerning given I drive on an interstate. This has happened 3 times in past 4 months and same exact thing at 10 mph and RPM went to 4 and 5 and car would not increase speed. I stopped vehicle and accelerated and then it operated normally. Dealership has been in unable to duplicate it and has questioned me several times about driving with two feet which I do not do and laying purse on console against shifter which I also do not do. 3 of the 4 times it happened it was at the beginning of my drive within first mile or so. 1 time was near end after about 20 miles. Purchased car used with 18000 miles on it and did not drive on interstate from July 2013 until March 2014 on regular basis.

- Summerville, SC, USA

Car put in park to call a persons house was at his neighbors house next door for directions ran off in ditch thought at time I might have left car in drive.went down bank when my dog and I stopped car in park did not think nothing else about it until today. Went to store came back parked 2012 Sonata in driveway left car on to run in house right quick so dog would be cool. I put legs outside car 2012 Sonata took off like a bat out of [xxx] threw me out on the ground. I hurt my back and rear end very painful and 2012 Sonata ran into my 2004 anniversary edition collectors car which was as close to new as they get. They have a recall on line that say the date has not been made to send out notices about a pin breaking in gear shift causing the car to go in park and still be in drive. I read on this same sight about a women who had her car do her the same way and had to have 10 stitches.I called Hyundai dealer near by they said bring it in to be checked.I asked who would fix my 2 wrecked car that will have a lots less value. He told me to call my insurance company. So I called accident will raise my insurance payment that will cost me the rest of my life. Do not know where they got this thing at the end of the mileage is 30,000,32000 or 45,000 miles and they are release from fault when people are coming close to getting killed or cripple for life. These car companies are getting away with things if I did in my business they would get everything I have and make me pay for life hope I have better luck than these other people. They are going to tow the car in and check the problem. Who is to say they will fix it and say nothing was wrong like I have already read. Please be careful if you on a 2012 Hyundai Sonata information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Lanett, AL, USA

The contact owns a 2012 Hyundai Sonata. The contact stated that after parking and turning off the vehicle in her residential garage, the vehicle started rolling backwards. In an attempt to stop the vehicle the contact fell which caused her to scrape her chin needing 10 stitches. The contact was taken to the emergency room. The failure mileage was 39,000. The consumer stated she and the police attempted to piece together the scenario, that the vehicle was not in park, when she turned it off. The consumer stated the vehicle could be put into any gear, and it could roll, whether it was on a flat of hilly surface. Updated 08/20/14 updated 8/27/14

- West Caldwell, NJ, USA

Starting on 10/16/2013 when attempting to accelerate, the vehicle did not respond. Rpms were at 3K and when I attempted to accelerate, there was no response even when pushing the gas pedal all the way to the floor. In another incident on 10/17, when attempting to accelerate, rpms spiked at 6.5K and the vehicle would not shift. On 10/18 I attempted and succeeded in replicating both behaviors. When experiencing the spiking rpms without shifting condition, I manually shifted the vehicle with the paddle shifter to get it to up shift. When the car began shifting again in on it's own, it then downshifted and an attempt to accelerate was met with no response even when pressing the accelerator all the way to the floor. These behaviors create dangerous driving conditions that prevent the driver from moving the car through an intersection or accelerating to get to speed to merge into traffic. I am taking the car in to have the dealer look at it today.

- Leesburg, VA, USA

On 09/22/13, I left for a 75 mile trip. When I first started my car that morning, I noticed it was moving sluggishly, but thought it was due to our overnight chilly temperatures. I drove the short distance to the interstate. As I attempted to merge onto the interstate, I had the most frightening experience of my life. I pressed on the accelerator to prepare to merge and discovered that I had practically no acceleration! my car got to between 5000 and 6000 rpms before it shifted out of first gear! at that point, I was going approximately 45 mph while trying to merge onto an interstate, in front of a semi that would not get over for me to merge. I literally had my accelerator pedal pushed to the floor, as the car again hit between 5000 and 6000 rpms to shift into second gear! I was able to eventually get my car to 65 and turn on the cruise control. I double checked to make sure I was in drive (rather than neutral or manual--no dashboard lights on). On occasion during that drive, I turned off the cruise and hit the accelerator to see if what I had experienced was a fluke'it was not. My accelerator was literally mashed to the floor as my car's speed slowly lurched higher, while my rpms raised above 5000 before shifting to the next gear. Once I returned home, I turned off my car for a few minutes, before restarting the vehicle to test it. The transmission problem was gone (although I question whether my turbo is still working effectively, as it seems less responsive). Today, I took my car to the local car dealership to address the recent Sonata recall, and I also requested they examine my transmission, describing the above incident to them. I noted that other drivers mentioned that a waste gate' issue appeared to be causing the shifting problems. They could find no problems and suggested I shifted into manual accidentally.

- Champaign, IL, USA

While driving on interstate 77 North bound in North Carolina I noticed the passenger safety seat belt light was flickering but there was no one or nothing on the seat to warrant the light turning on. So I reached over and snapped the seat belt in and the light turned off. About 10 miles afterwards the eps light starts flicking as well as the brake indicator on the dash, next thing you know the engine shuts down and power steering goes stiff. I manage to pull to the shoulder avoiding getting struck by a car or truck and I am not able to turn on the car back on. I am able to turn on all other items ( radio, turn signals, interior lisghts) I am not able to use the blue link service so I had to call aaa and have the car towed to the nearest dealership 18 miles away. I will have to wait until the dealership looks into the issue, its Sunday and the service department is closed.

- Montgomery, NY, USA

The transmission ceased to work while driving. This is a new car only one year old and needs a new transmission according to the dealer.

- Wyomissing, PA, USA

Stopped to put car in park and got stuck in reverse this the second time the has happened in a 10 day period. The first time happened they said the shifter cable came loose. Can you imagine if this happened to someone while they were driving?

- Seffner, FL, USA

On three separate occasions, the most recent, 2/4/13, I required quick acceleration to avoid a collision. A sudden thrust of the accelerator pedal should result in rapid acceleration, instead the car hesitates, de-accelerates, presumably while it tries to find a solution (battery vs gas), stalls, then slowly accelerates. This delay is dangerous and will result in an accident. Specifically, I approached a busy intersection where the traffic signal was not working. Drivers treated the intersection as a four way stop, as they should, when it was my opportunity to turn left, I executed my turn normally, but then noticed a truck crest the hill to my left at a high rate of speed about block away, I tried to accelerate quickly to finish my turn and get out of the way. The car felt like it powered down, sat there for a second, then accelerated slowly. The truck swerved and slammed on its breaks to avoid colliding with me. I have been driving for 30+ years, I am a safe, defensive driver. I have also owned another hybrid car (2007 Toyota Camry) where this problem did not occur. I have reported this problem to the dealership where I acquired the vehicle and filed a complaint with Hyundai corporate office. Additionally, two other issues I have experienced with this vehicle are; I have driven this car for 1,883 and recorded my mileage and gas purchases using the tools from fueleconomy.gov and have realized an overall mpg of $23.73. For a car that is supposed to achieve between 34 and 39 mpg, it misses the mark. The hybrid battery will not charge above 50%. occasionally, during highway driving, the hybrid battery will charge above 50%, but quickly depletes the battery to below 50% within a few miles. I wonder if this affects the cars lack of electric reserves when evasive driving measures are required. Hyundai service indicated the battery charge levels are normal.

- St. Louis, MO, USA

This is a hybrid vehicle. It chugs, hesitates and almost stalls when accelerating from a complete stop. The service people tell me that it is normal but this is my 3rd hybrid and this is not normal.

- Birmingham, AL, USA

Vehicle check engine lit and all dash lights lit upon starting the car. It would not let me shift it into any other gear. Car was towed to dealer for several days with them consulting with Hyundai. They replaced some control module to repair it. -------------------------- two weeks later, the same problem occurred. Idiot lights were on after starting the car, but I could not shift it out of park. Dealership swears its a different issue and they are consulting Hyundai yet again. My car has been in the dealership for over a week now and they can't tell me when I'll get it back.

- Cumberland, RI, USA