Theory Of Operation
WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) monitors throttle position through inputs from the two Throttle Position Sensors (TPS) inside the Throttle Body Assembly. If there is a discrepancy between the two sensors, then a failure is set. If the primary diagnostic feature does not capture the failure, then secondary software will determine that there is a coherency failure between the sensors.