WOMS
U code network High severity

U2958 Lost Communication with the Hybrid Powertrain Control Module (HPCM) A

The OBD2 code U2958 indicates a loss of communication with the Hybrid Powertrain Control Module (HPCM) A, suggesting that the vehicle's diagnostic system is unable to communicate with this specific module, which may...

Definition

The OBD2 code U2958 indicates a loss of communication with the Hybrid Powertrain Control Module (HPCM) A, suggesting that the vehicle's diagnostic system is unable to communicate with this specific module, which may affect hybrid system performance

Common causes

  • Faulty Hybrid Powertrain Control Module (HPCM)
  • Damaged or corroded wiring or connectors
  • Poor ground connections
  • Communication network issues (CAN bus problems)
  • Faulty or disconnected sensors
  • Software or firmware issues
  • Battery or power supply problems

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective Hybrid Powertrain Control Module (HPCM)
  • Issues with the Engine Control Module (ECM)
  • Battery or power supply problems
  • Faulty communication network (CAN bus issues)
  • Incorrectly diagnosed sensor failures
  • Software or firmware issues in the control modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the HPCM for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or damaged

  4. 4. Check Power and Ground

    Verify that the HPCM is receiving the correct voltage and ground. Use a multimeter to check for proper voltage at the module's power supply pins

  5. 5. Check the ground connections to ensure they are secure and free of corrosion

  6. 6. Inspect the HPCM

    If possible, check the HPCM itself for any visible signs of damage or failure. This may include checking for burnt components or water intrusion

  7. 7. Test Communication Lines

    Use a scan tool to check if the HPCM is communicating with other modules in the vehicle. If other modules are also not communicating, the issue may be with the communication bus (CAN bus)

  8. 8. Check the CAN bus wiring for shorts, opens, or other issues

  9. 9. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the manufacturer for any available updates for the HPCM

  10. 10. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the modules. Reconnect and see if the code reappears

  11. 11. Scan Tool Functionality

    Ensure that the scan tool you are using is compatible with the vehicle and can communicate with the HPCM. Some generic scanners may not access all modules

  12. 12. Check for Environmental Factors

    Consider if there have been any recent changes to the vehicle's environment, such as exposure to water or extreme temperatures, which could affect the HPCM

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the HPCM or communication issues for your specific vehicle make and model. Manufacturers often release TSBs for known issues.1

  14. 14. Professional Diagnosis

    If the issue persists after performing the above steps, it may be necessary to consult a professional technician or dealership for further diagnosis. They may have specialized tools and knowledge to address complex issues.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the U2958 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle model