P2105 Throttle Actuator Control System Forced Engine Shutdown

Definition

Common causes

• Throttle actuator failure
• Faulty throttle position sensor
• Wiring issues or short circuits in the throttle control circuit
• Malfunctioning engine control module (ECM)
• Vacuum leaks
• Faulty accelerator pedal position sensor
• Software issues or updates needed in the ECM
• Electrical connector problems or corrosion
• Issues with the vehicle's power supply or battery
• Overheating or mechanical binding in the throttle body

Common misdiagnoses

• Throttle position sensor failure
• Accelerator pedal position sensor issues
• Wiring or connector problems
• Engine control module (ECM) failure
• Vacuum leaks
• Fuel delivery issues
• Ignition system problems
• Mass airflow sensor malfunction
• Idle air control valve failure
• Mechanical issues in the throttle body

Troubleshooting steps

1. 1. Check for Additional Codes

   Use an OBD-II scanner to check for any other trouble codes that may be present. Codes related to the throttle position sensor, accelerator pedal position sensor, or other related systems can provide additional context

2. 2. Inspect Throttle Body

   Visual Inspection: Check for any physical damage, carbon buildup, or foreign objects in the throttle body

3. 3. Clean Throttle Body

   If there is carbon buildup, clean the throttle body using an appropriate cleaner

4. 4. Check Wiring and Connectors

   Inspect the wiring and connectors related to the throttle actuator and accelerator pedal position sensor for any signs of damage, corrosion, or loose connections

5. 5. Repair or replace any damaged wiring or connectors

6. 6. Test the Accelerator Pedal Position Sensor

   Use a multimeter to test the accelerator pedal position sensor for proper voltage and resistance readings. Compare the readings to the specifications in the vehicle’s service manual

7. 7. If the sensor is faulty, replace it

8. 8. Check Throttle Position Sensor

   Similar to the accelerator pedal position sensor, test the throttle position sensor for proper operation

9. 9. Replace if necessary

10. 10. Inspect the Engine Control Module (ECM)

    Ensure that the ECM is functioning correctly. Check for any software updates or recalls that may apply to the vehicle

11. 11. If the ECM is suspected to be faulty, it may need to be reprogrammed or replaced

12. 12. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could affect throttle operation. Use a smoke machine or spray soapy water to identify leaks

13. 13. Perform a Throttle Body Relearn Procedure

    After cleaning or replacing components, perform a throttle body relearn procedure as specified in the vehicle’s service manual. This helps the ECM recalibrate the throttle position

14. 14. Clear Codes and Test Drive

    After completing the above steps, 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. Consult a Professional

    If the issue persists after performing these troubleshooting steps, it may be necessary to consult a professional mechanic or technician for further diagnosis.Additional Considerations - Always refer to the specific service manual for the vehicle in question, as procedures and specifications can vary by make and model. - Ensure that the vehicle's battery is in good condition, as low voltage can sometimes cause erratic behavior in electronic systems. By following these steps, you should be able to identify and resolve the issue related to the P2105 code