U2965 – Lost Communication with the Hybrid Powertrain Control Module (HPCM) A.

The ODBII code U2965 indicates a loss of communication with the Hybrid Powertrain Control Module A, suggesting that the vehicle’s diagnostic system is unable to establish a connection with this specific module.

The severity of ODBII code U2965 is typically considered moderate to severe.

Common Causes For: U2964 Lost Communication with the Body Control Module (BCM) – Bus Off.

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

Common misdiagnosis for U2965 Lost Communication with the Hybrid Powertrain Control Module (HPCM) A.

• Faulty wiring or connectors
• Defective Hybrid Powertrain Control Module (HPCM)
• Issues with the Engine Control Module (ECM)
• Battery or charging system problems
• Faulty sensors related to the hybrid system
• Communication issues with other control modules
• Software or firmware issues in the HPCM or ECM

Common Troubleshooting Steps

When dealing with the OBD-II code U2965, which indicates “Lost Communication with the Hybrid Powertrain Control Module (HPCM) A,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other diagnostic trouble codes (DTCs) that may be present. This can provide additional context for the issue.
• 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.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or pushed back.
• Check Power and Ground: Verify that the HPCM is receiving the correct power supply and ground. Use a multimeter to check voltage at the module’s power and ground terminals.
• Inspect the HPCM: If accessible, inspect the HPCM for any physical damage or signs of water intrusion. If the module is damaged, it may need to be replaced.
• Check Communication Lines: Use a scan tool to check the communication lines (CAN bus) for proper operation. Look for any interruptions or faults in the communication network.
• You can also use an oscilloscope to check for signal integrity on the CAN bus.
• Test the HPCM: If possible, perform a functional test of the HPCM using a scan tool. This may involve checking for response to commands or monitoring live data.
• Check for Software Updates: Verify if there are any software updates available for the HPCM or the vehicle’s ECU. Sometimes, communication issues can be resolved with a software update.
• Inspect Other Modules: Since the HPCM communicates with other modules, check for issues in related modules that may affect communication. This includes the Engine Control Module (ECM) and Transmission Control Module (TCM).
• 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.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the HPCM.1
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in hybrid vehicles.Conclusion Troubleshooting OBD-II code U2965 involves a systematic approach to check for communication issues, inspect wiring and connectors, and ensure the proper functioning of the HPCM and related components. Always refer to the vehicle’s service manual for specific procedures and specifications.