I need help. Wife's car, 2010 Charger sxt, will not shift out of gear, at first it showed codes P0731 and P1790. Took the scanner home and cleared them, I drove it and it drove fine. She got in it, once again it wouldn't shift. This time only P0731 showed up. Cleared the codes again, this time I drove it for about an hour, mix of highway and stop and go in town. Did fine. I let it sit for about 45 minutes, drove it again, drove fine and didn't show any codes. Got in it this morning, won't shift and P0731 is back. Any advice?