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U1962 Lost Communication with the Hybrid Powertrain Control Module (HPCM) 2

The OBD2 code U1962 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 U1962 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
  • Poor electrical connections
  • Failed communication network (CAN bus issues)
  • Blown fuses
  • Software or firmware issues
  • Corrosion in connectors or terminals
  • Battery issues affecting power supply to the module

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
  • Software or firmware issues in the control modules
  • Communication issues with other control modules
  • Grounding problems in the electrical system

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or indicate related issues

  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 correct voltage and ground. Use a multimeter to check for proper voltage at the module's power and ground terminals

  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

    Inspect the CAN (Controller Area Network) bus lines for continuity and integrity. Look for shorts, opens, or high resistance in the communication lines

  8. 8. Use a scan tool to monitor the communication between modules. If other modules are not communicating, it may indicate a problem with the CAN bus

  9. 9. Test the HPCM 2

    If you have access to a compatible scan tool, perform a functional test of the HPCM 2 to see if it responds to commands

  10. 10. If the module is not responding, it may need to be replaced

  11. 11. Check for Software Updates

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

  12. 12. Inspect Related Components

    Check other components that may interact with the HPCM 2, such as the battery, inverter, or other hybrid system components, for faults

  13. 13. 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

  14. 14. 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 the U1962 code.1

  15. 15. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership with experience in hybrid vehicles. By following these steps, you should be able to identify the root cause of the U1962 code and take appropriate action to resolve the communication issue with the HPCM 2