P2128 - Throttle/Pedal Position Sensor/Switch 'E' Circuit High

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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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 Powertrain Control Module (PCM)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • No throttle pedal response

P2128 Description

The Accelerator Pedal Position (APP) sensor is an input to the Powertrain Control Module (PCM) and used to determine the amount of torque requested by the operator. There are 2 pedal position signals in the sensor. Both signals, APP and APP2, have a positive slope (increasing angle, increasing voltage), but are offset and increase at different rates. The 2 pedal position signals make sure the PCM receives a correct input even if 1 signal has a concern. The PCM determines if a signal is incorrect by calculating where it should be, inferred from the other signals. If a concern is present with one of the circuits the other input is used. There are 2 reference voltage circuits, 2 signal return circuits, and 2 signal circuits (a total of 6 circuits and pins) between the PCM and the APP sensor assembly. The pedal position signal is converted to pedal travel degrees (rotary angle) by the PCM. The software converts these degrees to counts, which is the input to the torque based strategy.
OBDII Code P2128 - Throttle/Pedal Position Sensor/Switch 'E' Circuit High - AutoCodes.com

P2128 Information for specific makes

  • P2128 ACURA Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage
  • P2128 BUICK Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 CADILLAC Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 CHEVROLET Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 DODGE Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 FORD Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 GMC Accelerator Pedal Position Sensor 2 Circuit High Voltage
  • P2128 HONDA Accelerator Pedal Position Sensor 'B' Throttle Position Sensor 'D' Circuit High Voltage
  • P2128 HYUNDAI Accelerator Position Circuit - High Input
  • P2128 INFINITI Accelerator Pedal Position Sensor Circuit
  • P2128 LEXUS Throttle Pedal Position Sensor/Switch 'E' Circuit Input High
  • P2128 LINCOLN Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 MERCEDES-BENZ Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 MERCURY Throttle/Pedal Position Sensor/Switch 'E' Circuit High
  • P2128 NISSAN Accelerator Pedal Position Sensor Circuit
  • P2128 SCION Throttle Pedal Position Sensor/Switch 'E' Circuit Input High
  • P2128 TOYOTA Throttle Pedal Position Sensor/Switch 'E' Circuit Input High

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