P0120 - Throttle Sensor/Pedal Position Circuit A ?!

yesterday i started my car and it had no power.
There was no cel.
After some time driving i stopped and started the car again.
Everthing seems to be fine again.
I connected my scanner and it showed:
P0120 - Throttle Sensor/Pedal Position Circuit A
Any Ideas what that could be?!
Thank you



