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P codepowertrainMedium severity

P1605Keep Alive Memory Test Failure

The OBD2 code P1605 indicates a Keep Alive Memory (KAM) test failure, which suggests that the vehicle's engine control module (ECM) is having trouble retaining stored data or settings, potentially due to a power supply...

Definition

The OBD2 code P1605 indicates a Keep Alive Memory (KAM) test failure, which suggests that the vehicle's engine control module (ECM) is having trouble retaining stored data or settings, potentially due to a power supply issue or a fault in the ECM itself

Common causes

  • Faulty PCM (Powertrain Control Module)
  • Corrupted or lost memory data
  • Poor electrical connections or wiring issues
  • Low battery voltage or weak battery
  • Faulty sensors or components affecting memory
  • Software or firmware issues in the PCM
  • Grounding issues in the vehicle's electrical system

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad wiring or connectors
  • Battery issues or low voltage
  • Corrupted software or firmware in the ECM
  • Faulty sensors (e.g., throttle position sensor)
  • Issues with the vehicle's electrical system
  • Problems with the ignition system
  • Faulty ground connections

Troubleshooting steps

  1. 1.Check Battery Voltage

  2. 2.Ensure the vehicle's battery is fully charged and in good condition. Low voltage can cause KAM issues

  3. 3.Inspect battery terminals for corrosion or loose connections

  4. 4.Inspect Fuses

  5. 5.Check the fuses related to the ECM and KAM. A blown fuse can disrupt the power supply to the ECM

  6. 6.Examine Wiring and Connectors

  7. 7.Inspect the wiring harness and connectors leading to the ECM for any signs of damage, corrosion, or loose connections

  8. 8.Pay special attention to ground connections, as poor grounding can lead to various electrical issues

  9. 9.Reset the ECM

  10. 10.Clear the code using an OBD-II scanner and see if it returns after a short drive. Sometimes, a simple reset can resolve temporary issues

  11. 11.Check for Other Codes

  12. 12.Look for any other stored trouble codes that may provide additional context or indicate related issues

  13. 13.Inspect the ECM

  14. 14.If the problem persists, the ECM itself may be faulty. Consider testing or replacing the ECM if other troubleshooting steps do not resolve the issue

  15. 15.Check for Software Updates

  16. 16.Some manufacturers release software updates for the ECM. Check if there are any updates available for your vehicle's make and model

  17. 17.Look for Environmental Factors

  18. 18.Ensure that there are no environmental factors affecting the vehicle's electronics, such as water intrusion or extreme temperatures

  19. 19.Consult Technical Service Bulletins (TSBs)

  20. 20.Check for any TSBs related to your vehicle's make and model that might address the P1605 code or KAM issues

  21. 21.Professional Diagnosis

  22. 22.If you are unable to resolve the issue, consider seeking help from a professional mechanic or dealership, as they may have specialized tools and knowledge to diagnose the problem accurately. By following these steps, you should be able to identify and potentially resolve the issue causing the P1605 code