Storing DTC P2109 OBDII code indicates that the Powertrain Control Module (PCM) detected a fault in the Throttle Position Sensor (TPS) / Pedal Position Sensor (PPS). Description “A”, applies to a particular sensor, so consult your vehicle’s data source.
The Drive-By-Wire System (DBW) is controlled by the PCM, through a throttle drive motor and throttle position sensors. This sensor usually has a 5 volt supply, and a ground signal. The PCM uses the inputs from this sensor to control the throttle actuator motor, which is responsible for opening or closing the throttle plate, thus allowing air into the intake.