DTC P2120: App Sensor 1 Circuit Malfunction: Description

The Accelerator Pedal Position (APP) sensor 1 is a potentiometer type sensor with the following 3 circuits:

• A 5-volt reference circuit.
• A low reference circuit.
• A signal circuit.

The control module provides the APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensor then provides the control module a signal voltage proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 1 signal or APP sensor 5-volt reference voltage is outside the predetermined range, this DTC sets.