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Circuit Description

The throttle body assembly contains the following components:

The throttle blade
The throttle actuator motor
The throttle position (TP) sensor 1 and 2
The throttle actuator control (TAC) module

The TAC system monitors the throttle position with 2 sensors. If the powertrain control module (PCM) receives a message from the TAC module that indicates TP sensor 1 voltage is outside a predetermined range, DTC P0120 will set.