I know this is an old thread but I figured I’d post an update. The code came back after a few months, along with a turbo compressor “surge” noise during shifts. I ended up replacing the diverter valve with an OEM unit from an ecoboost mustang (same part, CJ5G-9U465-BA). They are surprisingly difficult to find new in North America. I’ve had to for ~2 years with no issues or further servicing