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P0228 Throttle/Pedal Position Sensor/Switch C Circuit High Input

The OBD2 code P0228 indicates that the Throttle/Pedal Position Sensor/Switch C is sending a high voltage signal to the engine control module, which may suggest a malfunction in the sensor or its circuit

Definition

The OBD2 code P0228 indicates that the Throttle/Pedal Position Sensor/Switch C is sending a high voltage signal to the engine control module, which may suggest a malfunction in the sensor or its circuit

Common causes

  • Faulty throttle position sensor (TPS)
  • Damaged wiring or connectors
  • Short circuit in the circuit
  • Corroded connectors
  • Faulty accelerator pedal position sensor
  • Poor ground connection
  • Malfunctioning engine control module (ECM)

Common misdiagnoses

  • Throttle body issues
  • Accelerator pedal assembly failure
  • Wiring or connector problems
  • Engine control module (ECM) failure
  • Other throttle position sensor malfunctions
  • Vacuum leaks
  • Fuel system issues
  • Transmission problems

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 the Throttle Position Sensor (TPS)

    Locate the throttle position sensor and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the sensor is properly connected and that the wiring harness is intact

  4. 4. Test the Throttle Position Sensor

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

  5. 5. Check for a smooth voltage change as the throttle is opened and closed

  6. 6. Inspect Wiring and Connectors

    Check the wiring and connectors associated with the throttle position sensor for any signs of wear, fraying, or short circuits

  7. 7. Look for any signs of moisture or corrosion that could affect the electrical connections

  8. 8. Check for Ground Issues

    Ensure that the throttle position sensor has a good ground connection. A poor ground can lead to high input signals

  9. 9. Inspect the Accelerator Pedal Position Sensor

    If applicable, check the accelerator pedal position sensor, as it may also be related to the throttle control system

  10. 10. Perform similar tests as with the TPS to ensure it is functioning correctly

  11. 11. Check the Engine Control Module (ECM)

    If all sensors and wiring appear to be in good condition, the issue may lie with the ECM itself. Check for any software updates or recalls related to the ECM

  12. 12. In some cases, reprogramming or replacing the ECM may be necessary

  13. 13. Clear Codes and Test Drive

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

  14. 14. Take the vehicle for a test drive to see if the code returns

  15. 15. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Additional Tips: - Always refer to the vehicle’s service manual for specific testing procedures and specifications. - Ensure that you are working in a safe environment and take necessary precautions when dealing with electrical components. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0228 code