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P code powertrain High severity

P2135 Throttle/Pedal Pos Sensor/Switch A / B Voltage Correlation

The OBD2 code P2135 indicates a voltage correlation issue between the throttle position sensor and the accelerator pedal position sensor, suggesting that the signals from these sensors are not matching as expected

Definition

The OBD2 code P2135 indicates a voltage correlation issue between the throttle position sensor and the accelerator pedal position sensor, suggesting that the signals from these sensors are not matching as expected

Common causes

  • Faulty throttle position sensor (TPS)
  • Faulty accelerator pedal position sensor (APP)
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Mechanical issues with the throttle body
  • Calibration issues between sensors

Common misdiagnoses

  • Faulty throttle position sensor
  • Faulty accelerator pedal position sensor
  • Wiring issues or shorts in the harness
  • Faulty engine control module (ECM)
  • Issues with the electronic throttle control system
  • Vacuum leaks
  • Faulty mass air flow sensor
  • Problems with the intake air temperature sensor

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the throttle position sensor and accelerator pedal position sensor. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or corroded connectors

  5. 5. Signs of wear or short circuits

  6. 6. Test the Throttle Position Sensor (TPS)

    Use a multimeter to test the TPS for proper voltage and resistance. Check the following

  7. 7. Ensure the TPS is receiving the correct voltage (usually around 5V)

  8. 8. Verify that the output voltage changes smoothly as the throttle is opened and closed

  9. 9. Test the Accelerator Pedal Position Sensor (APP)

    Similarly, test the APP sensor using a multimeter. Check for

  10. 10. Proper voltage supply

  11. 11. Smooth voltage changes as the pedal is pressed and released

  12. 12. Check for Mechanical Issues

    Inspect the throttle body for any mechanical issues, such as

  13. 13. Sticking or binding throttle plates

  14. 14. Dirt or carbon buildup that may affect throttle operation

  15. 15. Perform a Throttle Body Cleaning

    If there is carbon buildup, clean the throttle body to ensure smooth operation

  16. 16. Check for Software Updates

    Verify if there are any software updates available for the vehicle’s ECM. Sometimes, manufacturers release updates to address known issues

  17. 17. 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

  18. 18. Replace Faulty Components

    If either the TPS or APP sensor is found to be faulty during testing, replace the defective component

  19. 19. Check ECM/PCM

    If all sensors and wiring are functioning correctly, the issue may lie within the Engine Control Module (ECM). In this case, further diagnostics may be required, and reprogramming or replacement of the ECM might be necessary.1

  20. 20. 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 P2135 code