WOMS
P code powertrain Medium severity

P068A ECM/PCM Power Relay De-Energized Performance Too Early

The OBD2 code P068A indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the power relay is de-energizing too early, which can affect the operation of the engine management...

Definition

The OBD2 code P068A indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the power relay is de-energizing too early, which can affect the operation of the engine management system

Common causes

  • Faulty ECM/PCM power relay
  • Weak or dead battery
  • Poor electrical connections or wiring issues
  • Faulty ECM/PCM
  • Corroded or damaged relay socket
  • Malfunctioning ignition switch
  • Software issues or programming errors
  • Short circuits in the wiring harness
  • Faulty fuses related to the power relay circuit
  • Grounding issues in the electrical system

Common misdiagnoses

  • Faulty ECM/PCM
  • Bad power relay
  • Wiring issues
  • Battery problems
  • Faulty ignition switch
  • Poor ground connections
  • Corroded connectors
  • Faulty fuses

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 Charging System

    Ensure that the battery is fully charged and in good condition

  3. 3. Check the alternator output to ensure it is providing adequate voltage

  4. 4. Inspect battery terminals and cables for corrosion or loose connections

  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 signs of damage or wear

  7. 7. Test the relay using a multimeter to ensure it is functioning properly. You can also swap it with a similar relay (if available) to see if the issue persists

  8. 8. Check Wiring and Connectors

    Inspect the wiring and connectors related to the ECM/PCM and the power relay for any signs of damage, corrosion, or loose connections

  9. 9. Pay special attention to ground connections, as poor grounding can lead to performance issues

  10. 10. Test the ECM/PCM

    If the relay and wiring are in good condition, the issue may lie with the ECM/PCM itself. Check for any software updates or recalls related to the ECM/PCM

  11. 11. If possible, perform a bench test of the ECM/PCM to ensure it is functioning correctly

  12. 12. Inspect Fuses

    Check the fuses related to the ECM/PCM and the power relay. Replace any blown fuses and ensure that the fuse connections are secure

  13. 13. Look for Short Circuits or Open Circuits

    Use a multimeter to check for short circuits or open circuits in the wiring harness that connects the power relay to the ECM/PCM

  14. 14. Check for Environmental Factors

    Sometimes, environmental factors such as moisture or extreme temperatures can affect the performance of electrical components. Inspect for any signs of water intrusion or damage

  15. 15. Clear Codes and Test Drive

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

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

  17. 17. Consult a Professional

    If the issue persists after performing these troubleshooting 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 steps, you should be able to identify and resolve the issue related to the P068A code