WOMS
P code powertrain Medium severity

P1258 Pedal Correlation PDS1 and PDS2

The OBD2 code P1258 indicates a problem with the correlation between the accelerator pedal position sensors (PDS1 and PDS2), suggesting that the signals from the two sensors do not match as expected

Definition

The OBD2 code P1258 indicates a problem with the correlation between the accelerator pedal position sensors (PDS1 and PDS2), suggesting that the signals from the two sensors do not match as expected

Common causes

  • Faulty accelerator pedal position sensor
  • Faulty throttle position sensor
  • Wiring issues or poor connections
  • 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) failures
  • Vacuum leaks
  • Fuel delivery issues
  • Transmission problems
  • Misinterpretation of other related codes

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing any related codes can help in diagnosing the issue

  2. 2. Inspect the Wiring and Connectors

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

  3. 3. Ensure that the connectors are securely attached and that there are no bent pins

  4. 4. Test the Sensors

    Use a multimeter to test the resistance and voltage output of the accelerator pedal position sensor (PDS1) and throttle position sensor (PDS2)

  5. 5. Compare the readings to the specifications provided in the vehicle’s service manual. If the readings are out of range, the sensor may need to be replaced

  6. 6. Check for Mechanical Issues

    Inspect the accelerator pedal assembly for any mechanical binding or obstruction that could affect the sensor readings

  7. 7. Ensure that the throttle body is clean and functioning properly, as a stuck throttle can also cause correlation issues

  8. 8. Perform a Throttle Position Sensor Calibration

    Some vehicles may require a throttle position sensor calibration after replacing the sensor or if there are issues with the throttle response. Refer to the service manual for the specific calibration procedure for your vehicle

  9. 9. Inspect the Engine Control Module (ECM)

    In rare cases, the issue may be related to the engine control module itself. Check for any software updates or recalls that may apply to the ECM

  10. 10. If all other components check out, consider having the ECM tested or reprogrammed

  11. 11. Clear Codes and Test Drive

    After performing the necessary repairs or adjustments, clear the trouble codes using the OBD-II scanner

  12. 12. Take the vehicle for a test drive to see if the code returns. Monitor the performance of the accelerator pedal and throttle response during the drive

  13. 13. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1258 code. Always refer to the vehicle's service manual for specific diagnostic procedures and specifications