2009 Nissan Altima 2.5 CVT weak acceleration? Symptoms p1778 code

2009 Nissan Altima cvt has very weak acceleration almost as if the car is in limp mode. Going up hills it has a particularly difficult time, but when I rev the engine in neutral or park it revs fine. I’m hoping this is a simple stepper motor or valve body job but I might have to replace the transmission. If you have had similar problems please let me know I will be updating this video and answering comments once I figure this out.