2010 Hyundai Elantra stopped moving what is the possible reason ?

Those trannys are notorious for failure. You usually have to replace the transmission input and output sensors and sometimes the Idle speed control as well. Try Amazon for the parts. Funny there's no check engine light on.

maybe it's a stupid question . But , how can I replace them ? :p

https://www.youtube.com/watch?v=QCCQobQmp78

Thank u a lot . Last 2 questions please .1- Do u have a video for " idle speed control " . 2- do u think that there's any other possible problems ? . u knew what the exact problem is right ?

I don't know for 100% that's what your issue is. I only know that those transmissions have problems and for some people, replacing those parts fixes their issues. The only way to be 100% sure is to take it to a tranny shop and have it torn down. Like I said in the above post, it's very odd that your check engine light isn't on. Usually if those parts fail, it triggers the light. That is why those mechanics you took it to can't figure it out. If your car was idling fine, I wouldn't bother changing out the idle speed control. Will your car move if you manually put it in 2 or 3?

the car just don't move at all . I try to trample the gas but it don't move when I put on " D / N / R " . The engine is good and started but the car don't move

I would say that your options are to replace the input and output components and hope that fixes it, or just bite the bullet and take it to a tranny shop. I would say take it to the shop. Usually if the components fail, it will still shift, just really poorly. I think you have something major that let go. I just checked the owners manual for your year. You're supposed to change the fluid at 60,000 miles. Not sure how many miles you have on your car, but if you've never changed it out and you have over 60k on the car, you may have burned it up.

I know this is an old post but I was wondering if you figured out what was wrong with your car ? My car is doing the same thing it won't move at all, just all of a sudden stopped. It did not even throw a code for me to pull up on a computer . I change the input output sensor and there was no change. I did drain the transmission fluid it was a reddish color it was not burnt. I was thinking about changing the wiring harness and put in a transmission pressure control solenoid before I put the transmission fluid and filter back in. I had read that the wiring harnesses goes bad . I bought this car used a few months ago with only 84,000 miles on it. Doing my research on the transmission the past month I found a number on my transmission and it was the VIN number off of another car I searched that car and that transmission only had 30,000 miles on it. I just wish the guy would have told me that he had recently put another Transmission in it.