Your accelerator pot neutral is probably to far from the last calibration date stored in the controller. When it happens, look in the windows2 of truck doctor for actual fault code and then address your issue from there. Also go in the calibration windows for the accelerator and look at the stored data and compare it with your actual value. If too far then calibrate it. If you cannot then replace the two pot gears that connect the pot to the pedal. If all good you might wanna look at then motor condition and the battery.