Unintended acceleration, had to slam on brakes and put car into neutral in order to prevent shooting into a intersection of oncoming traffic. The car immediately threw a number of codes, and a engine control system condition code, check engine code.... dealer tells me when unloaded off the tow-truck that the brake pedal went to the floor, after 6 days of having the car the dealership service manager is telling me no problem could be found due to not being able to reproduce the problem.

- Paris, KY, USA

2012 Hyundai Sonata. Consumer writes in regards to vehicle engine revved very high when started. The consumer took the vehicle to the dealer, but the problem could not be duplicated. Several weeks later, the engine revved to 4000 RPM. Again, the dealer was unable to duplicate the problem.

- Wolcott, CT, USA

Walked out of store I had been shopping in for over an hour and car was in flames. The fire investigator explained it as an electrical short that started at the main engine wire harness and melted the tubing/wiring all through the engine compartment down near passenger headlight and the melting wires/tubing/rubber dripped and ignited on a pile of leaves underneath the car in the parking space. The resulting fire and electrical burn melted all rubber plastic, external belts, wire harness, front bumper, intake manifold and any plastic rubber, fluid lids, exterior parts surrounding or attached to the engine.

- Matthews, NC, USA

2012 Hyundai Sonata gls. Mileage not as advertised. Sticker said 25 city and 35 highway. Have tracked mileage from 1000 to 5000 miles and averages 23 mpg including some highway driving. Never drive aggressively. I bought this car thinking I would be getting mileage as advertised. Tried to call Hyundai customer service at 800-633-5151 for a case number and was on hold for 10 minutes before hanging up. Allen Hyundai dealer says nothing they could do and recommended going to another dealer for mileage testing or call Hyundai customer service.

- San Juan Capistrano, CA, USA

The contact owns a 2012 Hyundai Sonata hybrid. The contact stated that while trying to accelerate from a complete stop, the vehicle jerked abnormally. The vehicle was taken to the dealer where the failure could not be replicated. The vehicle was not repaired. The manufacturer was contacted about the issue. The failure mileage was 108 and the current mileage was 850.

- Carlsbad, CA, USA

The contact owns a 2012 Hyundai Sonata hybrid. The contact stated when attempting to accelerate the vehicle hesitated to move. The vehicle was taken to the dealer who stated that was the operation of the vehicle. The manufacturer was notified who stated that was the operation of the vehicle when going from electric to gas. They offered no other assistance. The failure mileage was 3,500.

- Boca Raton, FL, USA