2009 Dodge Nitro shifting problem

I just got the info stating that, after some tests, seems like the problem is the computer. Any idea how much is the computer and if it fits from any american models of nitro's?

Ok, here are some updates. The car was taken out of the service, they said checked the transmission solenoids and were ok and changed the TCM, and in less than 10 miles. Same problem: the car got stuck into the second gear and enter into the service mode, unable to shift up or down. Any idea what can be wrong or what else can cause this problem? I am guessing this have nothing to do with cars being made for or in Europe, I am assuming are cars here that work in the same way, the problem is with finding/changing parts.

I was told that can be the transmission sensors. Where are those sensor located?

The latest info that I received is that when the car get stuck into the 2nd gear, some display shows the following " no signal rotation sensor number 2" What that means? Where is that sensor and how can I get there? Any idea how much that part cost?

Thanks so much. I think I will have my husband look at it, considering the fact that the people at the authorized garage where the car was, wasn't able to fix it. Do you have any idea which cars have the transmission like the Nitro? From the TCM experience, I was told that crysler 300c and newer models of intrepid.

Or I should say/ask. In which other cars I can find sensors like the one in the picture.

I do understand that and I really really appreciate your help. What I was trying to say is maybe some other transmissions uses the same sensors. Or in other words; take the sensors from a chrysler tranny and put them into this nitro tranny.( Interchangeable parts I think is the term)