WOMS
B code body Medium severity

B2105 Throttle Position Input Out of Range Low

The OBD2 code B2105 indicates that the throttle position input signal is reading lower than the expected range, suggesting a potential issue with the throttle position sensor or its circuit

Definition

The OBD2 code B2105 indicates that the throttle position input signal is reading lower than the expected range, suggesting a potential issue with the throttle position sensor or its circuit

Common causes

  • Faulty throttle position sensor (TPS)
  • Wiring issues or damaged connectors
  • Poor electrical connections
  • Throttle body malfunction
  • Engine control module (ECM) issues
  • Vacuum leaks
  • Calibration issues or software glitches
  • Mechanical binding in the throttle linkage

Common misdiagnoses

  • Faulty throttle position sensor (TPS)
  • Wiring issues or short circuits
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Malfunctioning accelerator pedal position sensor
  • Issues with the intake air temperature sensor
  • Problems with the mass airflow sensor (MAF)
  • Throttle body issues or carbon buildup
  • Software or calibration errors in the ECM
  • Faulty connectors or terminals in the throttle control circuit

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Throttle Position Sensor (TPS)

  3. 3. Visual Inspection

    Check the throttle position sensor for any physical damage, loose connections, or corrosion at the electrical connector

  4. 4. Wiring Check

    Inspect the wiring harness for any frayed wires, shorts, or open circuits

  5. 5. Test the Throttle Position Sensor

  6. 6. Use a multimeter to measure the voltage output of the TPS. The voltage should change smoothly as the throttle is opened and closed. If the voltage is consistently low or does not change, the TPS may be faulty and need replacement

  7. 7. Check Throttle Body

  8. 8. Inspect the throttle body for carbon buildup or obstructions that could affect the throttle plate's movement. Clean the throttle body if necessary

  9. 9. Ensure that the throttle plate moves freely and is not sticking

  10. 10. Inspect the Accelerator Pedal Position Sensor

  11. 11. If the vehicle has an electronic throttle control system, check the accelerator pedal position sensor for proper operation. A malfunctioning pedal sensor can affect the throttle position reading

  12. 12. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could cause incorrect air-fuel mixture readings, which may affect throttle position

  13. 13. ECM/PCM Update

    Check if there are any software updates available for the engine control module (ECM) or powertrain control module (PCM). Sometimes, manufacturers release updates to fix known issues

  14. 14. 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

  15. 15. Professional Diagnosis

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who can perform more advanced diagnostics, including checking the ECM for faults. By following these steps, you should be able to identify and resolve the issue related to the B2105 code