00 malibu code 742 how i can fix it

I have 00 malibu with code P0742, i think is a tranny sensor, somebody can tell me where is in the tranny and how a i can fixit?
Tks. for you help
I´m sorry for my write, i don´t speak ingles very well, put i understand, TKS everybody for you help

There was an earlier post on that same subject. Someone fixed theirs pretty easily. Do a search here from about 1 month ago..