My 2009 Hyundai Sonata will speed up when I remove my foot off the gas pedal. It will increase the RPM's by 1000 which increases the speed of the car. This has happened many times now to the point of returning my car to the dealer for repair while under warranty. But, with 52,000 miles this should not be happening at all.

- Midlothian, VA, USA

I have had 2 instances of sudden acceleration. 1st incident I was backing out of my garage and the car shot backward narrowly missing my house. 2nd incident about a month later I was pulling into a parking spot when the vehicle suddenly accelerated. The car shot forward & I had to slam on the brakes to avoid hitting a fence. Both incidents the vehicle was going less than 5 mph. I have also noticed the vehicle jerking occasionally in traffic when you ease up on the gas pedal.

- Olean, NY, USA

The contact owns a 2009 Hyundai Sonata gls (na). While driving approximately 60mph, the contact stated that the vehicle suddenly accelerated without warning. The dealer was notified who performed several test and was unable to duplicate the failure. One month later, the contact experienced sudden acceleration again. The manufacturer was contacted who was aware of her visit to the dealer and deemed the vehicle safe to drive. The vehicle had not been repaired. The current mileage was 16,000. The failure mileage was 18,000. Updated 03/11/11 updated 12/19/11

- Charleston, WV, USA

June 3, 2009 car accelerated on its own up to approx 65 mph when driver was pressing accelerator at 30 mph, and the car would not stop - driver stood on brakes, shifted to neutral, pulled up parking brake, got off road and turned off engine. Dealer made no repair-said their computer showed nothing wrong. August 12, 2009 car lost all power and engine lights came on - steered car off road. No repair made - dealer tightened gas cap- said computer showed nothing else wrong. August 17, 2009 car lost power again - steered off road. Dealer replaced the throttle assembly. June 24, 2010 car accelerated on its own up to 65 mph when driver pressed accelerator while going 40 mph, and the car would not stop - driver stood on brakes, shifted to neutral, pulled up parking brake, got off road and turned off engine. Driver called 911 and spoke to state highway patrol. Car was towed to dealer - no repair made, their computer showed nothing wrong. Dealer delivered car to my house, I have kept it off the road. Can't drive it, trade it, or sell it because it is dangerous.

- Middle River, MD, USA

The contact owns a 2009 Hyundai Sonata. While the contact was driving approximately 35 mph entering onto a highway into the left lane, unexpectedly the vehicle increased acceleration and the brakes would not function when engaged. The brake pedal was applied repeatedly, followed by no power response. After placing the gear selector into the neutral position the vehicle began to reduce speed. The vehicle was driven into a parking lot and the gear was shifted into the park position and the vehicle came to a stop. The contact was waiting on the roadside assistance for the vehicle to be towed to an authorized dealer at the time of the complaint. The failure mileage was 17,300.

- South Holland, IL, USA

2009 Hyundai Sonata limited 4 cyl. While cruise control was on, when resuming speed after slowing down for traffic, car continued on thru set resume speed (70) to 80+. control reestablished by shutting off cruise control. This did not happen every times but it did happen multiple times, Mar. 12 - 14, 2010. It had not occurred before. We have not used cruise control since. Dealer could not replicate. Unresolved.

- Clarence, NY, USA

1. driving from harrisburg to pottstown pa 2. non-responding throttle at 60 mph. Pulled over to the shoulder, shut off and restarted the engine. Worked ok for a few miles; again, the throttle became unresponsive. 3. found internal failure with throttle position sensor which was subsequently replaced.

- Pottstown, PA, USA

The contact owns a 2009 Hyundai Sonata. While driving 25 mph, he slowed the vehicle down and began approaching a curb when the vehicle accelerated on it's own. The driver took his foot off of the brakes then he engaged the brakes again in order to drive onto the emergency lane. The contact experienced extreme difficulty while turning the steering wheel and attempted to stop the vehicle. The dealer stated that they were unable to duplicate or diagnose the failure. The contact does not feel safe driving the vehicle. The failure mileage was 400. The current mileage was 765 miles.

- New Orleans, LA, USA

The contact owns a 2009 Hyundai Sonata. While driving 50 mph downhill with the cruise control engaged, the vehicle accelerated up to 80 mph. The dealer test drove the vehicle and confirmed the failure, but stated that nothing could be done to correct the issue. The contact called Hyundai customer support and they also could not assist. He believes that driving the vehicle would be a safety risk due to the manufacturer defect. He also believes that a recall should be issued as well as a remedy for the failure. The contact discovered other consumers that were experiencing the same issue with the same type of vehicle. The failure mileage was 16,000 and current mileage was 17,000. Updated 10/06/09. Updated 10/08/09.

- Stanfordville, NY, USA