Floorplate switch problems will sometimes give you this indication. I usually see left pedal or right pedal of center handle, and it all ends up being wiring to the floorplate. It could just as well be a handle problem. You need a book. You can check all the switches and potentiometers from the dashboard in analyzer mode. If you have the dreaded standard display,which has much less characters on the display than the enhanced display, the anyalyzer mode is tricky.