P2122 Throttle Pedal Position Sensor/Switch D Circuit Input Low

P2122 Throttle Pedal Position Sensor/Switch D Circuit Input Low

Possible causes
– Faulty Accelerator Pedal Position (APP) Sensor
– Accelerator Pedal Position (APP) Sensor harness is open or shorted
– Accelerator Pedal Position (APP) Sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P2122 Description

The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal to detect the angle of the accelerator pedal. This sensor is electronically controlled and uses Hall-effect elements.

In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the Engine Control Module (ECM) changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.

The ECM monitors the accelerator pedal angle from VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.

3 thoughts on “P2122 Throttle Pedal Position Sensor/Switch D Circuit Input Low

  1. i have a 2008 dodge ram 2500 4×4 truck 6.7 diesel engine and the throttle pedal position sensor light comes on on the dash and i replaced the pedal sensor and then i drive the truck and the lighting bolt signal comes back on on the dash and the and it shows code of p2122 what do i do .

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