Bought it like this and trying to figure why. Code is P0740 and P0743. It will go about a mile then go into Limp Mode with the Orange Wrench symbol and will die. If I pull over and restart it will go another mile before doing it again. Any Tips?
Trans is 5R55S

 

You do a google search for what the codes mean?

P0740 Torque Converter Clutch Circuit Malfunction
P0742 Torque Converter Clutch Circuit Stuck On

 

Yes I did but I don't really know that much about a Torque Converter Clutch Circuit. Never had Transmission problems before. Guess I better start learning and probably take it to a shop on a flat bed trailer. From what I've read that model has always had problems but it's a little too complicated for a Carpenter. Was hoping for some tips on fixing it myself or if it should be taken care of at a shop.