WOMS
U code network High severity

U1293 Lost Communication with Hybrid Powertrain Control Module (HPCM) A

The OBD2 code U1293 indicates that there is a loss of communication with the Hybrid Powertrain Control Module (HPCM) A, which may affect the vehicle's hybrid system performance

Definition

The OBD2 code U1293 indicates that there is a loss of communication with the Hybrid Powertrain Control Module (HPCM) A, which may affect the vehicle's hybrid system performance

Common causes

  • Faulty Hybrid Powertrain Control Module (HPCM)
  • Damaged or corroded wiring or connectors
  • Poor ground connection
  • Faulty communication network (CAN bus issues)
  • Software or firmware issues
  • Battery or power supply problems
  • Intermittent electrical connections

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 glitches 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. Other codes may provide more context or indicate related issues

  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

    Power Supply: Verify that the HPCM is receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connections

    Ensure that the ground connections for the HPCM are secure and free of corrosion

  6. 6. Inspect the HPCM

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

  7. 7. Test Communication

    Scan Tool Communication: Use a scan tool to see if you can communicate with the HPCM. If you cannot, it may indicate a problem with the module or the communication lines

  8. 8. Network Communication

    Check the communication lines (CAN bus) for continuity and proper operation. Look for shorts or opens in the wiring

  9. 9. Check for Intermittent Issues

    Sometimes, communication issues can be intermittent. Pay attention to any patterns, such as specific driving conditions or temperatures that may affect communication

  10. 10. Inspect Other Modules

    Since the HPCM communicates with other modules, check for issues in related modules that may affect communication. This includes modules like the Engine Control Module (ECM) or Transmission Control Module (TCM)

  11. 11. Update Software/Firmware

    Check if there are any software updates available for the HPCM or other related modules. Sometimes, communication issues can be resolved with a software update

  12. 12. Perform a Hard Reset

    Disconnect the battery for a few minutes to reset the vehicle’s computer systems. Reconnect and see if the code reappears

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U1293 code or the HPCM for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations.1

  14. 14. Replace the HPCM (if necessary)

    If all other troubleshooting steps fail and the HPCM is determined to be faulty, replacement may be necessary. Ensure that the new module is programmed and calibrated correctly.1

  15. 15. Seek Professional Help

    If you are unable to resolve the issue, consider seeking assistance from a qualified technician or dealership, especially if specialized diagnostic equipment is needed. By following these steps, you should be able to identify the root cause of the U1293 code and take appropriate action to resolve the communication issue with the Hybrid Powertrain Control Module