WOMS
P code powertrain Medium severity

P1255 Pedal Correlation PDS2 and LPDS Low

The OBD2 code P1255 indicates a problem with the correlation between the pedal position sensor (PDS2) and the low pedal position sensor (LPDS), suggesting a discrepancy in their readings

Definition

The OBD2 code P1255 indicates a problem with the correlation between the pedal position sensor (PDS2) and the low pedal position sensor (LPDS), suggesting a discrepancy in their readings

Common causes

  • Faulty accelerator pedal position sensor
  • Faulty throttle position sensor
  • Wiring issues or poor connections in the pedal position circuit
  • Malfunctioning engine control module (ECM)
  • Vacuum leaks
  • Throttle body issues
  • Software glitches or updates needed in the ECM

Common misdiagnoses

  • Throttle position sensor issues
  • Accelerator pedal position sensor faults
  • Wiring or connector problems
  • Engine control module (ECM) malfunctions
  • Vacuum leaks
  • Fuel delivery issues
  • Air intake system problems
  • Transmission issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the throttle position sensor and pedal position sensors. Look for signs of damage, corrosion, or loose connections

  3. 3. Test the Pedal Position Sensors

    Use a multimeter to test the resistance and voltage output of the pedal position sensors. Compare the readings to the specifications in the vehicle’s service manual

  4. 4. Check for proper operation of both the PDS2 (primary) and LPDS (low) sensors

  5. 5. Check for Mechanical Issues

    Ensure that the accelerator pedal is not sticking or obstructed. Check for any mechanical binding or issues with the throttle body

  6. 6. Inspect the Throttle Body

    Check the throttle body for cleanliness and proper operation. A dirty or malfunctioning throttle body can affect sensor readings

  7. 7. Verify ECM Functionality

    Ensure that the ECM is functioning correctly. If the ECM is not processing the signals from the sensors properly, it may need to be reprogrammed or replaced

  8. 8. Clear Codes and Test Drive

    After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P1255 code for your specific make and model. Manufacturers may have known issues and recommended fixes

  10. 10. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s make and model.Conclusion By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1255 code. Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications