WOMS
P code powertrain High severity

P068F stands for "ECM/PCM Power Relay Sense Circuit Range/Performance Problem

The OBD2 code P068F indicates a problem with the power relay sense circuit for the Engine Control Module (ECM) or Powertrain Control Module (PCM), specifically related to its range or performance

Definition

The OBD2 code P068F indicates a problem with the power relay sense circuit for the Engine Control Module (ECM) or Powertrain Control Module (PCM), specifically related to its range or performance

Common causes

  • Faulty ECM/PCM power relay
  • Poor electrical connections or wiring issues
  • Faulty ECM/PCM
  • Short circuit in the power relay sense circuit
  • Open circuit in the power relay sense circuit
  • Corroded connectors or terminals
  • Faulty fuses related to the power relay
  • Voltage supply issues to the ECM/PCM

Common misdiagnoses

  • Faulty ECM/PCM
  • Bad power relay
  • Wiring issues or shorts in the circuit
  • Battery or charging system problems
  • Faulty ignition switch
  • Poor ground connections
  • Corroded connectors or terminals
  • Incorrectly installed aftermarket accessories

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 the battery is fully charged and in good condition

  3. 3. Check the alternator output to ensure it is providing the correct 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 and inspect it for any signs of damage or wear

  6. 6. Test the relay using a multimeter to ensure it is functioning properly. If it is faulty, replace it

  7. 7. Check Wiring and Connectors

    Inspect the wiring and connectors associated with the ECM/PCM power relay and sense circuit for any signs of damage, corrosion, or loose connections

  8. 8. Look for frayed wires, broken connectors, or any signs of short circuits

  9. 9. Test the Sense Circuit Voltage

    Use a multimeter to measure the voltage at the ECM/PCM power relay sense circuit. Compare the readings to the specifications in the vehicle’s service manual

  10. 10. If the voltage is outside the expected range, trace the circuit back to identify any faults

  11. 11. Inspect the ECM/PCM

    If all other components check out, the issue may lie within the ECM/PCM itself. Inspect for any signs of damage or water intrusion

  12. 12. If necessary, reprogram or replace the ECM/PCM according to manufacturer specifications

  13. 13. Check for Ground Issues

    Ensure that the ECM/PCM has a good ground connection. A poor ground can lead to erratic behavior and trigger codes like P068F

  14. 14. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  15. 15. Take the vehicle for a test drive to see if the code returns. Monitor the vehicle’s performance and check for any warning lights

  16. 16. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P068F code for your specific vehicle make and model. Manufacturers may have issued guidance or fixes for known issues

  17. 17. Seek Professional Help

    If you are unable to resolve the issue after following these steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with your vehicle. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P068F code