Hey guys I have an 08 67 fully deleted using cummins efi tuner from alligator performance. just recently the truck has been going into limp mode throwing codes p2509 p0700 p0750 . when i reset the truck the truck is shifting normally in auto mode or paddle mode... i dont understand what could be causing this issue any advice.?

 

The 750 code is a shift solenoid A issue. Sounds like you have a solenoid pack that needs replaced. There are threads on here. Several guys have done it them selves.