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P code powertrain High severity

P068C ECM/PCM Power Relay Sense Circuit Range/Performance Problem

The OBD2 code P068C indicates a problem with the power relay sense circuit for the Engine Control Module (ECM) or Powertrain Control Module (PCM), suggesting that the voltage levels are outside the expected range or not...

Definition

The OBD2 code P068C indicates a problem with the power relay sense circuit for the Engine Control Module (ECM) or Powertrain Control Module (PCM), suggesting that the voltage levels are outside the expected range or not performing as intended

Common causes

  • Faulty ECM/PCM power relay
  • Poor electrical connections or wiring issues
  • Faulty ECM/PCM
  • Low battery voltage
  • Corroded or damaged connectors
  • Blown fuses
  • Short circuits in the relay circuit
  • Grounding issues

Common misdiagnoses

  • Faulty ECM/PCM
  • Bad power relay
  • Wiring issues or shorts
  • Battery problems
  • Grounding issues
  • Faulty sensors
  • Corroded connectors
  • Software issues or updates needed

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 the Battery and Connections

    Ensure the battery is fully charged and in good condition

  3. 3. Check all battery connections for corrosion, looseness, or damage

  4. 4. Inspect the ground connections to ensure they are clean and secure

  5. 5. Examine the Power Relay

    Locate the ECM/PCM power relay in the fuse box or relay panel

  6. 6. Inspect the relay for any signs of damage or wear

  7. 7. Swap the relay with a similar one (if available) to see if the problem persists

  8. 8. Test the Relay Circuit

    Use a multimeter to check the voltage at the relay terminals

  9. 9. Ensure that the relay is receiving the correct voltage when the ignition is turned on

  10. 10. Check for continuity in the relay coil and contacts

  11. 11. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the ECM/PCM power relay for any signs of damage, fraying, or corrosion

  12. 12. Look for any loose or disconnected wires that could affect the relay's operation

  13. 13. Check the ECM/PCM

    If the relay and wiring are in good condition, the issue may lie within the ECM/PCM itself

  14. 14. Inspect the ECM/PCM for any signs of physical damage or water intrusion

  15. 15. If possible, perform a software update or reflash the ECM/PCM

  16. 16. Test the Power Supply

    Verify that the ECM/PCM is receiving the correct power supply voltage

  17. 17. Check the fuses related to the ECM/PCM and replace any that are blown

  18. 18. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  19. 19. Take the vehicle for a test drive to see if the code reappears

  20. 20. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis.Additional Tips: - Always refer to the vehicle's service manual for specific wiring diagrams and troubleshooting procedures. - Be cautious when working with electrical components to avoid causing further damage. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P068C code