help with fault codes

[mountainman]

I realize this is a 986 forum, but I have always gotten more useful info here than on the 996 forums.
On my 02 Carrera 4 I am getting PSM and ABS dash lights and when I hook up the durametric I get a tiptronic code 50 (impermissible transmission ratio) that will not clear. (nothing shows up on the dash regarding the transmission and it is operating as it should) I also get an ABS code 4460 (pressure sensor) that will clear, but comes right back when I start it up.
The dash lights came on a couple of times and would clear when the ignition was turned off and back on and be good for a few days and then I had ignition switch problems and assumed it was related, but after changing out the switch I still have these fault codes.
Anyone have any ideas?