Help With Error Codes

When i check the error codes i get a 12 then 45 then anouther 45 and 55 saying it is over. I have found what the 12 means but have yet to find out what the 45 means. Any help would be great. Oh ya and the car was working fine befor but now it will not fully turn over if u need more info plz ask.

Thanks

I checked two sources and could not find a code 45.
Recheck the codes.

I have rechecked the codes several times and made sure that the flashes from the check engin light matches the # dispalayed were the mialage is displayed. I will be replacing the fule filter and checking the pump while the tank is dropped. I hope this will help. If any one knows what this code means pleas let me know.

Thanks

What year?
93-95
Code 45 - Overdrive Solenoid, Problem detected in the overdrive solenoid circuit.

96 and up.
Code 45 - Trans temp sensor voltage too low. Voltage less the 1.55 volts.

it is a 97...thanks