No Gear indicator Light, Throttle Body malfunctions

The Gear light indicators won’t come up, car will not Accelerate as normal. When I tried to check the functionality of the Throttle body using the ignition mode, the throttle flap wont open when pedal is pressed but will shake a little but when I return the key to off position, it will then open and close.
At start, the car will jerk and off by it self, when I press the throttle the is a serious lag before the engine will respond to the pedal pressed. I scanned the vehicle and only code set is U0101.
How can I perform a test to make sure am not having a wiring mix with another ground wire, etc.