Fail To Accelerate problems of the 2012 Hyundai Santa Fe

The contact owns a 2012 Hyundai Santa Fe. The contact stated that the vehicle failed to accelerate from a brief stop. The contact had to disengage the traction control, turn off the vehicle and restart in order to resolve the failure. The vehicle was taken to the dealer for diagnostic and the computer was reprogrammed. The failure recurred. The manufacturer was made aware of the failure, but offered no further assistance. The failure mileage was 11,000. The current mileage was 12,243. . . . Updated 06-19-13 the consumer stated the failure occurred three times. During each occurrence the vehicle would fail to accelerate, then the vehicle would shut off and the engine light turned on. Updated 06/28/2013.

While driving my 2012 Hyundai Santa Fe (mileage approx. 13366) on the highway in fairly heavy traffic at around 70 mph and applying pressure to the accelerator, suddenly the vehicle failed to accelerate. I heard a little "blip" noise and felt a very slight jerk, kind of like a sudden gear change or something like that, then the car suddenly started decelerating. I barely missed getting rear-ended by another vehicle and managed to coast across two lanes of traffic to the shoulder of the road without getting hit. I stopped the car and turned it off and called the Hyundai dealership and asked them what I should do. I told them the engine malfunction light was on. They indicated that they had never heard of a vehicle doing this before. They said if the malfunction light wasn't blinking, the car was safe to drive and to bring it in at my earliest convenience. On the way home, the deceleration issue happened approximately 3 or 4 more times. This is an incredibly dangerous issue with the vehicle. Took it to a local dealership and the paperwork said they found issue via TSB. They did an ecm upgrade. Vehicle worked just fine for a month and a half and then the exact same problem occurred again. This time I was able to make it home, fortunately without getting into a major accident. Had to stop and start the car about 3 times to get home. Called roadside assistance and had it towed to a different dealership to see if they can find the real problem this time. At this point, I'm not sure if I will ever feel safe driving this vehicle again. How will I know if the issue has really been fixed? this is a very serious, dangerous problem that could potentially lead to a tragic accident. It's hard to believe that there hasn't been a recall issued to fix this problem.