This code is a rotor position sensor failure, commonly a high resistance connection at the sensor terminal-harness connector. I've previously just cleaned the terminals, added a little contact grease and re-assembled with success for several years. This time I changed out the sensor. It's working perfectly again. It's all done from under the machine with minimal dis-assembly. Watch the video for details and you need very few tools (a hex wrench for the rotor, 10 mm socket for the stator bolts, small straight screwdriver) plus a little contact grease from the local auto store.