WOMS
P code powertrain Medium severity

P1125 Throttle position sensor intermittent

The OBD2 code P1125 indicates an intermittent issue with the throttle position sensor, which measures the position of the throttle plate and sends this information to the engine control module

Definition

The OBD2 code P1125 indicates an intermittent issue with the throttle position sensor, which measures the position of the throttle plate and sends this information to the engine control module

Common causes

  • Faulty throttle position sensor (TPS)
  • Poor electrical connections or wiring issues
  • Corroded or damaged connectors
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Throttle body issues
  • Intermittent short circuits
  • Grounding problems

Common misdiagnoses

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

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors associated with the throttle position sensor for any signs of damage, corrosion, or loose connections

  2. 2. Look for Vacuum Leaks

    Ensure there are no vacuum leaks in the intake system that could affect throttle performance

  3. 3. Check Throttle Position Sensor

    Test the TPS: Use a multimeter to check the resistance and voltage output of the TPS. Compare the readings to the manufacturer's specifications

  4. 4. Check for Smooth Operation

    Manually move the throttle plate and observe the TPS output. It should change smoothly without any dead spots

  5. 5. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue

  6. 6. Inspect the Throttle Body

    Clean the Throttle Body: Carbon buildup can affect the throttle position sensor's readings. Clean the throttle body and ensure it operates smoothly

  7. 7. Check for Mechanical Issues

    Ensure that the throttle plate opens and closes freely without sticking

  8. 8. Test the Engine Control Module (ECM)

    Check ECM Functionality: If the TPS and wiring are in good condition, the issue may lie with the ECM. Ensure that the ECM is functioning correctly and is properly grounded

  9. 9. Perform a Wiggle Test

    Check for Intermittent Connections: While monitoring the TPS signal with a multimeter or scan tool, gently wiggle the wiring harness and connectors to see if the signal fluctuates, indicating a poor connection

  10. 10. Clear Codes and Test Drive

    Reset the Codes: After performing repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the P1125 code returns

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for TSBs: Look for any manufacturer-specific TSBs related to the throttle position sensor or related components that may provide additional guidance

  12. 12. Seek Professional Help

    Consult a Mechanic: If the issue persists after performing these steps, it may be best to consult a professional mechanic for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P1125 code