The codes can be found in the How-To Documents found in the upper right hand corner of this page.
If these other things can not fix it, it could be your power steering. It does not use PS fluid, but Tranny fluid. There is an O-Ring that leaks and that could be your problem too. If it is moist around the tank, and it is low, there is a How-To on that too. It is very simple and you can do it in less than 30 minutes. Good luck.