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

This is a new Hyundai Sonata 2015. The engine check light came on and the engine started running erratically. The following symptoms can be a safety concerns: 1. sometimes when idling at intersection the engine RPM goes up all of a sudden and the car starts moving forward and only a stronger push on the brakes stops the car from crashing into the vehicle ahead or running a red light. 2. when driving on highway the car lacks power even if the gas pedal is depressed all the way into the floor. This prevents the car from properly accelerating when merging into incoming traffic. I took the car to the dealership and they identified the issue is "cam cover leaking" and "oil coming through the oil seal making the motor do weird things". these are the quotes from the paper I got from the dealer. The car spent 2 weeks with the dealer. They replaced the cam cover. But 2 days later the problem appeared again. I'm afraid of driving this car now, because engine behaves erratically. And this car only has 3500 miles on it.

- Lewis Center, OH, USA