Vehicle suddenly loses acceleration and drops to a maximum speed of 20 mph. Check engine light turns on but goes away after shutting down the car and leaving it on standby for a few minutes. Occurs every few hundreds miles. It's happened while the car is in motion, both on the street and highway.

- Torrance, CA, USA

While driving on highway I-10 w was driving at 65 mph, had to brake to slow down to about 10 mph behind traffic that was slowing down and came to complete halt with foot on brake. When traffic cleared, on releasing brake and trying to accelerate again the car would not engage in any gear. Brought the car to park position and turned off engine and tried to restart the car, the car would continue to be on starter mode even though the engine had started. After several tries the car restarted but the gear would not engage. Moved the shift to shiftronic mode but the car would still not engage in any gear. Had to call in a tow company and wait in the car for over 30 minutes of harrowing experience in an unsafe situation. Car was towed to the dealership. They have been unable to replicate the problem. This is the 4 instance when the car has stalled in the middle of traffic in a highly unsafe situation. The car dealers response has been unsatisfactory. Wonder if they have contacted the manufacturer about this highly unsafe failure in the car. Number of people are on the road with risk of a serious accident.

- Houston, TX, USA

Car wouldn't shift into 1st gear. It just made a grinding noise. Finally it went into gear but kept making a noise when in 1st gear.

- Endicott, NY, USA

Genesis 4.6 hesitates when attempting to accelerate from slow speed (creep). Hesitation may be up to 3-4 seconds making entering heavy traffic dangerous and unsafe. The problem is intermittent and therefore difficult for dealership to duplicate. Although there seems to be a number of complaints on the internet describing the problem, Hyundai refuses to acknowledge a manufacturing issues with certain transmissions.

- Knoxville, TN, USA

This is a recurring hesitation problem. I first noticed this when making a turn into traffic. The hesitation is significant. In some cases there is an acceleration pause of 1-2 seconds. This does not occur every time I accelerate but its lack of predictability is a problem in and of itself. I have come close to being rear ended because the car would just not move when I pressed the accelerator. Also, when the car windows are up and the car sits in the sun for a few hours the central nav and communication system over heats and will not function until it cools off (maybe 20 minutes). In the meantime, back up camera does not work, temperature controls do not work and the bluetooth system does not function.

- Marina Del Rey, CA, USA