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P code powertrain Medium severity

P1670 Electronic Feedback Signal Not Detected

The OBD2 code P1670 indicates that the engine control module (ECM) is not receiving the expected electronic feedback signal from a component, often related to the throttle or transmission control system

Definition

The OBD2 code P1670 indicates that the engine control module (ECM) is not receiving the expected electronic feedback signal from a component, often related to the throttle or transmission control system

Common causes

  • Faulty Engine Control Module (ECM)
  • Damaged wiring or connectors
  • Faulty throttle position sensor (TPS)
  • Malfunctioning accelerator pedal position sensor
  • Issues with the electronic throttle control system
  • Software issues or glitches in the ECM
  • Poor ground connections
  • Interference from aftermarket modifications or devices

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad wiring or connectors
  • Malfunctioning throttle position sensor (TPS)
  • Defective mass air flow sensor (MAF)
  • Issues with the vehicle's battery or charging system
  • Problems with the ignition system
  • Faulty fuel injectors
  • Incorrectly calibrated or malfunctioning cruise control system

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 Wiring and Connectors

    Examine the wiring and connectors related to the throttle position sensor, accelerator pedal position sensor, and ECM. Look for signs of damage, corrosion, or loose connections

  3. 3. Test the Throttle Position Sensor (TPS)

    Use a multimeter to test the TPS for proper voltage and resistance. Ensure that it is functioning within the manufacturer's specifications

  4. 4. Test the Accelerator Pedal Position Sensor

    Similar to the TPS, check the accelerator pedal position sensor for proper operation. Verify that it is sending the correct signals to the ECM

  5. 5. Check for Ground Issues

    Ensure that all ground connections related to the ECM and sensors are secure and free of corrosion. Poor grounding can lead to signal issues

  6. 6. Inspect the ECM

    If all sensors and wiring appear to be functioning correctly, the ECM itself may be at fault. Check for any signs of damage or water intrusion

  7. 7. Perform a Visual Inspection

    Look for any obvious signs of wear or damage in the engine bay, especially around the throttle body and related components

  8. 8. Clear the Code and Test Drive

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

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any manufacturer-specific TSBs related to the P1670 code, as there may be known issues or recalls that apply to your vehicle

  10. 10. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P1670 code