I replaced the TCM unit with the exact model number, programed and all. Installed it and the green FLASHING light went away and a green SOLID "S" light now stays on and doesn't shift proper. Speedometer OK. We tried the back up 12 volt fuse removal and I have checked all fuses in all boxes.

Where the diagnostic Plug that is to be jumped for codes, only affects the CEL and doesn't blink the S light for codes.

How to make the solid Green S monster go away so my tranny will work right!