[Kontagious]

Today my tanny started acting up...it lost 2 gear, OD and Reverse. I was driving and it down shifted into 1st gear, then back to 3rd, never going to 2nd. Once I stopped, it wouldn't go into reverse. The OBD-II reader tells me the code is P0751, saying the the shifter silenoid A CKT performance or stuck off. I have looked in my Chilton book, but it says nothing about that code or about the transmission having a shift silenoid. Please help ASAP! Thanks!!!