Transmission problem?? HELP!

[jlafowler]

My automatic 2005 LS is now sitting still. I was driving down the road one day and my car became quieter than usual and as I was pressing the accelerator it wasn't going any faster. My fiance' drove it and found out that it won't go past the 2nd gear. He said it might be the transmission control module. Is he right? I really need to get it fixed and if anyone else has had this issue or is a mechanic do you know how much it would cost?
Any input would be great.
Thanks.

[NickLuce]

Well bro how hard do u drive it i mean from my exsperiance when a tranny drops like that its gone but could be a little thing. If u want it done right take it to aamco but if not go to chevy but i think u dropped ur tranny awhile back but finally got to the point where is just didnt want go anymore