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P code powertrain High severity

P2123 Throttle/Pedal Position Sensor/Switch "D" Circuit High

The OBD2 code P2123 indicates that the Throttle/Pedal Position Sensor or switch "D" is sending a high voltage signal, which may suggest a malfunction or an issue in the sensor circuit

Definition

The OBD2 code P2123 indicates that the Throttle/Pedal Position Sensor or switch "D" is sending a high voltage signal, which may suggest a malfunction or an issue in the sensor circuit

Common causes

  • Faulty throttle position sensor
  • Damaged wiring or connectors
  • Short circuit in the throttle position sensor circuit
  • Corroded connectors
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Mechanical issues with the throttle body

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
  • Ignition system problems

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 multiple 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 Wiring and Connectors

    Inspect the wiring leading to the TPS for any signs of wear, fraying, or short circuits

  7. 7. Ensure that all connectors are clean, tight, and free from corrosion

  8. 8. 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

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

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the throttle position sensor and related components are secure and free from corrosion

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

    If all other components check out, there may be an issue with the ECM itself. Check for software updates or reprogramming if necessary

  12. 12. Clear the Codes and Test Drive

    After performing 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

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P2123 code for your specific vehicle make and model, as there may be known issues or recalls

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P2123 code