Accelerator Pedal Position Sensor Testing and Replacement | Drive By Wire Sensor

How to test and replace an Accelerator Pedal Position Sensor, or APP sensor. Commonly known as a "Drive By Wire" setup.

P2122 - Accelerator Pedal Position Sensor A Circuit Low Voltage
P2123 - Accelerator Pedal Position Sensor A Circuit High Voltage
P2127 - Accelerator Pedal Position Sensor B Circuit Low Voltage
P2128 - Accelerator Pedal Position Sensor B Circuit High Voltage

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The accelerator position sensor simply detects the accelerator position and sends that info to the vehicles computer, or ECM. Typically, the accelerator position sensor has two sensors which act as a potentiometer. The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor.

Common symptoms of a bad APP sensor include:
- lack of power
- engine stall
- erratic idle

Having a trouble code comes down to a bad sensor or a problem with the wiring:

P2122 - APP Sensor A or Sensor 1 low voltage
P2123 - APP Sensor A or Sensor 1 high voltage
P2127 - APP Sensor B or Sensor 2 low voltage
P2128 - APP Sensor B or Sensor 2 high voltage
P2138 - APP Sensor A/B or Sensor 1 & 2 Incorrect voltage

Note:
Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.

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