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P2118 Throttle Actuator Control Motor Current Range/Performance

The OBD2 code P2118 indicates a problem with the throttle actuator control motor, specifically that its current range or performance is outside the expected parameters, which can affect engine performance and response

Definition

The OBD2 code P2118 indicates a problem with the throttle actuator control motor, specifically that its current range or performance is outside the expected parameters, which can affect engine performance and response

Common causes

  • Faulty throttle actuator motor
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Throttle position sensor malfunction
  • Engine control module (ECM) issues
  • Vacuum leaks
  • Mechanical binding in the throttle body
  • Faulty accelerator pedal position sensor
  • Software issues or updates needed in the ECM
  • Dirty or clogged throttle body

Common misdiagnoses

  • Throttle body failure
  • Accelerator pedal position sensor issues
  • Wiring or connector problems
  • Engine control module (ECM) failure
  • Vacuum leaks
  • Mass airflow sensor malfunction
  • Fuel delivery issues
  • Ignition 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. Addressing related codes can help pinpoint the issue

  2. 2. Inspect Throttle Body

    Visually inspect the throttle body for any signs of dirt, carbon buildup, or physical damage. Clean the throttle body if necessary, as buildup can affect performance

  3. 3. Check Throttle Position Sensor (TPS)

    Test the throttle position sensor for proper operation. Use a multimeter to check the voltage output and ensure it is within the manufacturer's specifications

  4. 4. Inspect Wiring and Connectors

    Examine the wiring and connectors related to the throttle actuator control motor and TPS. Look for frayed wires, corrosion, or loose connections that could cause intermittent issues

  5. 5. Test Throttle Actuator Control Motor

    If possible, test the throttle actuator control motor for proper operation. This may involve checking resistance and ensuring it responds correctly to input signals

  6. 6. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could affect the throttle's performance. A vacuum leak can cause erratic engine behavior and trigger throttle-related codes

  7. 7. Inspect Engine Grounds

    Ensure that all engine ground connections are secure and free of corrosion. Poor grounding can lead to electrical issues affecting the throttle control system

  8. 8. Perform a Throttle Body Relearn

    After cleaning or replacing components, perform a throttle body relearn procedure as specified by the vehicle manufacturer. This helps the engine control module (ECM) recalibrate the throttle position

  9. 9. Check Battery Voltage

    Ensure the vehicle's battery is fully charged and that the voltage is within the normal range. Low voltage can affect electronic components

  10. 10. Scan for Software Updates

    Check if there are any software updates available for the vehicle's ECM. Sometimes, manufacturers release updates to address known issues. 1

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the P2118 code for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations. 1

  12. 12. Replace Faulty Components

    If any components are found to be faulty during testing (e.g., throttle body, TPS, or wiring), replace them as necessary. If the issue persists after following these steps, it may be advisable to consult a professional mechanic or technician for further diagnosis and repair