2012 Hyundai Sonata Hybrid: sudden unintended acceleration

Filed Apr 29, 2024 · Transmission · 76,000 miles · TX

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that while driving at an undisclosed speed and depressing the brake pedal, the vehicle lunged forward. The vehicle was taken to an independent mechanic and diagnosed with automatic transmission failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 76,000.

Filed Apr 13, 2018 · Acceleration, Engine · IL

Tl* the contact owns a 2012 hyundai sonata hybrid. While driving various speeds or making a turn, the vehicle would sputter and then stall without warning. In addition, the vehicle experienced a drastic reduction in speed. When the accelerator pedal was depressed, it traveled to the floorboard, and then the vehicle would suddenly accelerate. The vehicle was taken to the dealer (bob brady auto mall, 4025 e boyd rd, decatur, il 62521, (217) 876-3800) where it was awaiting diagnostic testing. The contact stated that a possible cause of the failure could be the wastegate actuator. The manufacturer was notified of the failure and the contact was awaiting their response. The VIN and failure mileage were not available.

Filed Dec 28, 2016 · Acceleration · 149,000 miles · NM

This vehicle has sudden unintended acceleration as well as continued acceleration after the foot is completely removed from the pedal. I have experienced several near accidents as a result of the problem while the vehicle was in motion. The dealer has been unable to fix the problem, which has been reported several times over the life of the vehicle and still has not been fixed.

Filed Dec 1, 2015 · Acceleration · 51,000 miles · NC

While on cruise control at 68mph I was going down a small hill & my car suddenly accelerated from 68mph to 82mph at which point I disengaged my cruise control & the car decelerated . I noted the mileage & took the car to hyundai. They found no abnormal event in the computer log.this begs the issue that I did have this event occur. I had the compute microcode upgraded to the last rev earlier this year.

Filed Jan 13, 2014 · Acceleration, Transmission · 8,900 miles · CT

See submission number 10559603 sent prior to this on 1/14/2014: this is a continuation of the explanation of the cruise control/transmission/power train issue experienced with the vehicle since new. The text from that submission continues to its end. "it would appear that the cruise control/power train computer program has some errors in it or needs updating to correct the problem of excessive acceleration when re-attaining a set speed from a coast down that causes the car to go below the set speed before the sensors detect and activate the acceleration required to bring the car back up to the set speed. Then is 'shoots' the car forward at full power-like unintended acceleration might- and send it up to as much as 10 MPH above the 'then set' speed I have desired. If there is a corner at the end of the rise, the car can feel out of control during this acceleration as it is at full power during the acceleration phase. The transmission also down shifts 2 or 3 gears during this process which aggravates the fierce acceleration feeling. These incidents have been reported both to the hyundai dealer and to hyundai. Hyundai says, take it to our dealer; the dealer says they can find nothing wrong as no dash warning lights are ever showing and their electronic scanning brings up nothing of any kind of problem. This may or may not be exclusive to the sonata hybrid with cruise control and since many people do not use cruise control on winding rural roads, they may not/never experience the same sensation that can happen often to me. I can deal with it. The federal safety agency should keep this report on file in case other cruise control or acceleration issues with hyundai vehicles surface as my report is precisely defined as to what type of road condition it occurs on and what happens. Thank you.