WOMS
U code network High severity

U2969 Lost Communication with the Hybrid Powertrain Control Module (HPCM) 2

The OBD2 code U2969 indicates a loss of communication with the Hybrid Powertrain Control Module 2, suggesting that the vehicle's diagnostic system is unable to communicate with this specific module, which may affect...

Definition

The OBD2 code U2969 indicates a loss of communication with the Hybrid Powertrain Control Module 2, 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) 2
  • Damaged wiring or connectors in the communication circuit
  • Poor ground connection
  • Failed or malfunctioning communication network (CAN bus)
  • Corroded or loose connectors
  • Software issues or programming errors
  • Battery or power supply issues affecting the HPCM 2
  • Interference from aftermarket modifications or devices

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 sensors related to the hybrid system
  • Communication issues with other control modules
  • Software or firmware issues in the HPCM or ECM

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 2 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 2 is receiving the proper power supply and ground. Use a multimeter to check voltage at the module's power and ground pins

  5. 5. Inspect the HPCM 2 Module

    If possible, check the HPCM 2 module itself for any signs of physical damage or water intrusion

  6. 6. If the module is removable, consider reseating it to ensure a good connection

  7. 7. Check Communication Lines

    Use a scan tool to check the communication lines (CAN bus) for continuity and proper operation. Look for any shorts or open circuits

  8. 8. If you have access to a known good vehicle, compare the communication signals

  9. 9. Test the HPCM 2

    If you suspect the HPCM 2 is faulty, you may need to test it or replace it. This may require specialized equipment or professional assistance

  10. 10. Inspect Related Modules

    Check other modules in the vehicle that communicate with the HPCM 2. Issues in these modules can sometimes cause communication problems

  11. 11. Check for Software Updates

    Verify if there are any software updates available for the HPCM 2 or the vehicle’s main control module. Sometimes, manufacturers release updates to fix communication issues

  12. 12. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the codes and take the vehicle for a test drive to see if the code returns

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented common issues and fixes for this code.1

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who specializes in hybrid vehicles. By following these steps, you should be able to identify the root cause of the U2969 code and take appropriate action to resolve the communication issue with the Hybrid Powertrain Control Module 2