Ray i posted the following from another post awhile back. Hope this helps.
Same as the F16 code on the Plat 2 series. I call this "Turtle Hand Enigma" or THE. Usually operators will drive up and ask while holding the lever and say "hey whats this mean?" Waaaay more often this is set by operator than actual problem. Operators will in the beginning complain of unit dropping out of drive and they might see a brief flash of the P22. When this occurs is when i start checking into things further. An application of silicone type grease to connector female before connection to switch helps to reduce this if unit is in a very bumpy enviroment. This being a P code on the LO1 / LO2 series and is related to VCM, the P22 will go away when cause is rectified.

Try cleaning the switch wiring connector first