02 PT Cruiser with Tranny Codes

I have an 02 PT Cruiser that was running perfectly fine until today. It did not want to shift and the check engine light came on. I checked it and it came up with 3 codes: P0700 (Trans Control Sys Malfunction), P0870 (Tans Fluid Press Sensor/Switch C Circuit), and P0731 ( Gear 1 Ratio Incorrect). Can someone please tell me what could be the problem??

Thanks

How many miles ? when is the last time you service it ?