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P code powertrain High severity

P1573 Throttle Position Not Available

The OBD2 code P1573 indicates that the vehicle's engine control module (ECM) is unable to receive a valid throttle position signal from the throttle position sensor, which can affect engine performance and response

Definition

The OBD2 code P1573 indicates that the vehicle's engine control module (ECM) is unable to receive a valid throttle position signal from the throttle position sensor, which can affect engine performance and response

Common causes

  • Faulty throttle position sensor (TPS)
  • Wiring issues or damaged connectors
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Throttle body issues
  • Malfunctioning accelerator pedal position sensor
  • Software issues or updates needed in the ECM
  • Electrical shorts or open circuits in the throttle control system

Common misdiagnoses

  • Throttle Position Sensor (TPS) failure
  • Accelerator Pedal Position Sensor issues
  • Wiring or connector problems
  • Engine Control Module (ECM) malfunction
  • Vacuum leaks
  • Faulty mass airflow sensor
  • Intake manifold issues
  • Electronic throttle control system faults
  • Software or calibration issues in the ECM
  • Battery or charging 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 Throttle Position Sensor (TPS)

  3. 3. Visual Inspection

    Check the TPS for any physical damage, corrosion, or loose connections. Ensure that the wiring harness and connectors are secure and free from damage

  4. 4. Testing the TPS

    Use a multimeter to test the TPS. Check the resistance and voltage output according to the manufacturer's specifications. The TPS should provide a smooth voltage change as the throttle is opened and closed

  5. 5. Check Wiring and Connectors

    Inspect the wiring and connectors leading to the TPS and the ECM. Look for frayed wires, broken connectors, or any signs of short circuits. Repair or replace any damaged components

  6. 6. Inspect the Throttle Body

    Ensure that the throttle body is clean and functioning properly. Carbon buildup can affect the operation of the throttle plate. Clean the throttle body if necessary

  7. 7. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could affect the throttle position readings. Use a smoke machine or spray soapy water around the intake manifold and vacuum hoses to identify leaks

  8. 8. Test the ECM

    If all other components check out, the issue may lie with the ECM itself. Ensure that the ECM is receiving the correct signals from the TPS. In some cases, reprogramming or replacing the ECM may be necessary

  9. 9. Perform a Throttle Position Reset

    Some vehicles may require a throttle position reset after repairs. This can often be done by disconnecting the battery for a few minutes or following a specific procedure outlined in the vehicle's service manual

  10. 10. Check for Software Updates

    Sometimes, manufacturers release software updates for the ECM that can resolve known issues. Check with the dealership or manufacturer for any available updates

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the P1573 code for your specific vehicle make and model. These bulletins may provide additional guidance or known fixes

  12. 12. Professional Diagnosis

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle. They can perform more advanced diagnostics and repairs. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P1573 code