P1634 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

P1634 Code failures by brands

P1634 AUDI, VOLKSWAGEN: ACCELERATOR PEDAL POSITION SENSOR 2 SIGNAL INPUT HIGH

Description of DTC code P1634

The APP sensor (Accelerator Pedal Position) is a device whose function is simple to understand because it tells the Powertrain Control Module (PCM) in which position the accelerator pedal is located. In other words, it is in charge of informing whether or not the driver presses the accelerator pedal.

There are 2 APP sensors installed in the car and both provide electrical signals to the PCM, through which they deliver the corresponding information. It is worth mentioning that these sensors should not be confused with the TPS, and although their operation is similar, they have totally separate tasks depending on the position of the accelerator pedal.

The fault code P1634 OBD2 is a code that Audi and Volkswagen vehicle manufacturers use to indicate that the Accelerator Pedal Position Sensor 2 has a high input voltage signal provided.

Symptoms of fault code P1634

  • Check Engine light comes on.
  • Excessive fuel consumption.
  • Reduced engine power.
  • Delays during acceleration.

Causes of OBD2 P1634

DTC P1634 OBDII is set for one of the following reasons:

  • The Accelerator Pedal Position Sensor 2 may have damage to its wiring harness.
  • The APP sensor 2 circuit may be shorted.
  • The APP sensor 2 may be faulty.

Possible solutions of the DTC code P1634

The steps to follow to properly troubleshoot the P1634 OBD2 diagnostic code are:

  • Consult the Technical Service Bulletins.
  • Check the wiring of the accelerator pedal position sensor. Check that it has no damage due to wear or burns and if you detect such conditions, make the proper repairs.
  • Following the manufacturer's recommendations, perform voltage tests on the APP sensor circuit to verify that it is not shorted or open. If you discover no damage to the electrical connections, the sensor may be defective and should be replaced.

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