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

The ODBII 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.

The severity of ODBII code U2969 is typically considered moderate to severe.

Common Causes For: U2968 Lost Communication with the Hybrid Powertrain Control Module (HPCM) A.

• 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 misdiagnosis for U2969 Lost Communication with the Hybrid Powertrain Control Module (HPCM) 2.

• 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

Common Troubleshooting Steps

When dealing with the OBD-II code U2969, which indicates “Lost Communication with the Hybrid Powertrain Control Module (HPCM) 2,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• 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.
• 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.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or damaged.
• 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.
• Inspect the HPCM 2 Module: If possible, check the HPCM 2 module itself for any signs of physical damage or water intrusion.
• If the module is removable, consider reseating it to ensure a good connection.
• 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.
• If you have access to a known good vehicle, compare the communication signals.
• 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.
• Inspect Related Modules: Check other modules in the vehicle that communicate with the HPCM 2. Issues in these modules can sometimes cause communication problems.
• 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.
• 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 documented common issues and fixes for this code.1
• 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.