Won't go over 20 MPH
 

I have a 2012 G37S, About a month ago I noticed it seems to bog down when I go around a corner and give it gas. Now it won't go over twenty miles an hour and feels weak.
Seems to rev to high R's in neutral, but doesn't feel strong? I have to floor it to keep it at 20 MPH. Feels normal off the line, up to 20.
My code reader has a number in red PO732 in the upper right corner and in the middle says "Gear 2 incorrect ratio." The next screen reads "U1000" in red "CAN Communication System"
Quick test results says; ABS one code, TCM one code, ECM one code, OBDll/EOBD one code. But I could only pull up the two codes.
Your input appreciated.

Transmission issue, seems like it’s slipping causing it to not go above 2nd gear