Transmission Sensor problems of the 2012 Hyundai Elantra

I've had my car for 4 years. And the last three years it started having issues. Hard shifting and shaking at random times engine light coming on and off. I've taken it to the shop countless times and only recently was given a diagnosed with a transmission sensor reading too hot. Before that every mechanic said they couldn't see any issue . I find it alarming though because we don't really know if it's the sensor or actually the transmission and it's frustrating that nobody seems to have had any answers for the last so many years. It seems like it's a very common issue. And something that should have been able to be pinpointed and resolved much sooner. A few months ago when it would shift abruptly it was definitely a safety hazard on the road. Currently it's not lunging as dramatically. However it's still difficult to drive. I have kept up on all the maintenance religiously including flushing the transmission fluid and replacing it as directed. I definitely think that it should be investigated because everyone I know that has a Hyundai Elantra has had the exact same issue. And it definitely could cause accidents especially for inexperienced drivers.

Hello, well, I am the first owner, and there was not any accident before. Last Thursday, after I started my car, I tried to shift the gear to drive, and the car was suddenly shook. I kept tried to drive it, but whenever the rpm goes up to 2000, the car was bouncing like that I stepped on the brake or so. I was not even able to drive it, and it was even so dangerous to drive. Therefore, I just tried it again at night, and the engine light turned on. I put my car into the fitzgerald Hyundai service center in gaithersburg, MD on Friday morning (11/7/14), and I got my car back yesterday. When I picked up my car, I asked them what was the wrong with it, and they told me that the transmission sensor did not lead the temperature. Therefore, I told them that I put my car into the Hyundai service center in fairfax, va three months ago for the exact same problem, and the fairfax representative told me that they could not find any problems with it, so they just reset the software so that it is going to be fine. However, this happened again after few months. A man from fitzgerald told me that this time they update some numbers, so it is going to be fine. I do not know whenever this happens, the engine light turned on, too, and it seems like that it is breaking transmission and the engine together. Since this was not my first time, I reported this to the Hyundai recall service center. They called me yesterday and told me that they do not know the reason, but they fixed it. How come they can fix it even if they do not know the reason? I kept complained about it, and they just told me that they will expand the dates for the warranty so that I can fix it whenever it happens again! they also said that they do not know the next step for it. How irresponsible! now, all I can think of is that this is the defected car. Can you please investigate this? thank you.

I have a Hyundai Elantra limited, 2012, with the technology package. There are multiple issues with my car, that have occurred since I purchased it brand new off the lot in 2011. Whenever I take the car to the shop to have the issues checked, I am always told that they were unable to replicate the problem, so couldn't find anything to fix. First, there are serious issues with the transmission. When taking the car out of park and into drive or reverse, it often lurches into gear, which then continues as I drive into 1st, 2nd, 3rd, and sometimes 4th gear. It shifts really hard, as if the car were a manual and I was not shifting very well between gears. A couple of months ago (~June 2015) the check engine light came on for the first time, and the shop said that it was a transmission temperature sensor error. The check engine light came on the 2nd time this week on 7/14, and turned off within 24 hours. I've continued to have this jerking shift issue, though it never seems to happen when it's at the shop. Second, there is some kind of electrical issue/short in the car, because sometimes when I have windows down and I hit the lever to roll the driver's window up the sunroof also starts to open/close! or, the windows don't go up/down as hard/soft as I move the lever. Also, in the past month or so (July 2015) the proximity key seems to not work, and I have to press the button on the door handle multiple (up to 10) times before the car will lock/unlock. This also prevents me from being able to start the car (ignition switch) because it doesn't recognize the key is inside the vehicle. Please help!.