WOMS
P code powertrain Medium severity

P1252 Pedal Correlation PDS1 and LPDS High

The OBD2 code P1252 indicates a problem with the correlation between the pedal position sensor (PDS1) and the low pedal position sensor (LPDS), suggesting that the signals from these sensors are not aligning as...

Definition

The OBD2 code P1252 indicates a problem with the correlation between the pedal position sensor (PDS1) and the low pedal position sensor (LPDS), suggesting that the signals from these sensors are not aligning as expected, which can affect throttle response and engine performance

Common causes

  • Faulty accelerator pedal position sensor
  • Faulty throttle position sensor
  • Wiring issues or poor connections in the pedal or throttle sensor circuits
  • Malfunctioning engine control module (ECM)
  • Vacuum leaks
  • Faulty or dirty throttle body
  • Issues with the cruise control system (if equipped)

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. Addressing any other codes first can help narrow down the issue

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the pedal position sensors. Look for signs of damage, corrosion, or loose connections that could affect the signal

  3. 3. Test the Pedal Position Sensors

  4. 4. Use a multimeter to test the resistance and voltage output of both the PDS1 and LPDS. Compare the readings to the specifications provided in the vehicle's service manual

  5. 5. Check for proper operation by manually moving the accelerator pedal and observing the sensor outputs

  6. 6. Check for Mechanical Issues

    Ensure that the accelerator pedal assembly is functioning correctly and is not sticking or binding. Mechanical issues can cause incorrect sensor readings

  7. 7. Inspect the Throttle Body

    If the vehicle has an electronic throttle control system, inspect the throttle body for cleanliness and proper operation. A dirty or malfunctioning throttle body can affect performance

  8. 8. Check for Software Updates

    Sometimes, manufacturers release software updates for the engine control module (ECM) that can resolve issues related to sensor correlation. Check with the dealership for any available updates

  9. 9. Clear the Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  10. 10. Replace Faulty Components

    If the sensors are found to be faulty or if the wiring is damaged beyond repair, replace the affected components

  11. 11. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1252 code