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P code powertrain High severity

P2128 Throttle/Pedal Position Sensor/Switch "E" Circuit High

The OBD2 code P2128 indicates that the Throttle/Pedal Position Sensor/Switch "E" circuit is reading a high voltage signal, which may suggest a malfunction in the sensor or its wiring

Definition

The OBD2 code P2128 indicates that the Throttle/Pedal Position Sensor/Switch "E" circuit is reading a high voltage signal, which may suggest a malfunction in the sensor or its wiring

Common causes

  • Faulty throttle position sensor (TPS)
  • Damaged wiring or connectors in the throttle position circuit
  • Poor electrical connections
  • Faulty accelerator pedal position sensor
  • Short circuit in the throttle/pedal position sensor circuit
  • Open circuit in the throttle/pedal position sensor circuit
  • Malfunctioning engine control module (ECM)

Common misdiagnoses

  • Throttle body issues
  • Accelerator pedal position sensor failure
  • Wiring or connector problems
  • Engine control module (ECM) failure
  • Other throttle position sensor malfunctions
  • Vacuum leaks
  • Fuel system issues
  • Ignition system 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 and help identify related issues

  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 wiring harness and connectors are secure and free from dirt or moisture

  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 manufacturer's specifications

  5. 5. Check for proper operation by moving the throttle plate and observing the sensor's output

  6. 6. Check the Pedal Position Sensor

    Similar to the TPS, inspect and test the pedal position sensor for proper operation and voltage output

  7. 7. Ensure that the sensor is functioning correctly and that there are no issues with the wiring

  8. 8. Inspect Wiring and Connectors

    Check the wiring and connectors associated with the throttle and pedal position sensors for any signs of wear, fraying, or damage

  9. 9. Look for any short circuits or open circuits in the wiring that could cause high voltage readings

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the throttle and pedal position sensors are secure and free from corrosion

  11. 11. A poor ground can lead to erratic sensor readings

  12. 12. Examine the Engine Control Module (ECM)

    If all sensors and wiring appear to be functioning correctly, the issue may lie within the ECM itself

  13. 13. Check for any software updates or recalls related to the ECM that may address this issue

  14. 14. Clear Codes and Test Drive

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

  15. 15. Take the vehicle for a test drive to see if the code reappears

  16. 16. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis.Additional Considerations

  17. 17. Battery Voltage

    Ensure that the vehicle's battery is in good condition and providing the correct voltage, as low voltage can affect sensor readings

  18. 18. Environmental Factors

    Sometimes, environmental factors such as moisture or extreme temperatures can affect sensor performance. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2128 code