Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2008 DODGE 6.7 68RFE TRANS CODE P0770-4C SOLENOID CIRCUIT
HELLO EVERYONE I AM TRYING TO DIAGNOSE THIS TRUCK. IT IS GOING INTO LIMP MODE I HAVE A COUPLE SCOPE CAPTURES OF THE 4C SOL CTRL AND THE UD SOL CTRL TO COMPARE IT SEEMS I AM LOSING THE GROUND FROM THE TCM. I AM BACKPROBED AT THE TCM USING A VANTAGE PRO CH 1 IS THE 4C CH 2 IS THE UD SOL. I AM SORRY IA M VERY NEW AT USING A SCOPE I HAVE DONE AMP DRAW TESTS AND CHECKED RESISTANCE AND SOLENOIDS ARE TESTING OK. I CAN PROVIDE MORE INFO AS NEEDED TO NOT MAKE THIS POST TOO LONG. THANK YOU IN ADVANCE
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.
Just posting the resolution ended up being a bad TCM. I swapped the pins for the 4C and the 2C solenoid let it idle in park and would continue to set the same code.