P1125 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

P1125 Code failures by brands

P1125 FORD, LINCOIL, MAZDA: THROTTLE POSITION INTERMITTENT SENSOR

P1125 BUICK: ACCELERATOR PEDAL POSITION SENSOR FAULT

P1125 CADILLAC, CHEVROLET: ACCELERATOR PEDAL POSITION SENSOR FAULT

Description of DTC code P1125

The Accelerator Pedal Position Sensor (AAP) is a potentiometer whose resistance varies and sends a voltage signal to the ECM (Engine Control Module). The purpose of this sensor is to determine the position of the accelerator. The signal sent by these sensors is proportional to the movement of the pedal. The signal increases when the accelerator is opened.

The ECM provides the Throttle Position Sensors with a 5V reference circuit and a low reference circuit. If the ECM observes that the Throttle Position Sensor 1 and Throttle Position Sensor 2 have no correction in their signal circuits, the fault code P1125 OBDII will be set.

Symptoms of fault code P1125

Causes of OBD2 P1125

The reasons for setting the diagnostic code P1125 OBD2 are the following:

  • APP Sensor wiring may have burn or corrosion damage.
  • The Accelerator Pedal Position Sensor circuit connectors may not be adjusted properly.
  • The APP sensor may be defective.

Possible solutions of the DTC code P1125

To solve the DTC code P1125 OBDII, take into account the following:

  • Check the TSB (Technical Service Bulletins).
  • Check the APP Sensor circuit for damage to its cables or connectors. If you note features such as burn spots, wear, or corrosion on these electrical components, make the necessary repairs or changes.
  • Consult the service manual for the diagnostic steps of the APP Sensor. Make some checks as indicated by the manufacturer, and if you determine that the sensor is in poor condition, replace it.

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