U2958 – Lost Communication with the Hybrid Powertrain Control Module (HPCM) A.

The ODBII code U2958 indicates a loss of communication with the Hybrid Powertrain Control Module (HPCM) A, 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 U2958 is typically considered moderate to severe.

Common Causes For: U2957 Lost Communication with the Steering Angle Sensor.

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

Common misdiagnosis for U2958 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 power supply problems
• Faulty communication network (CAN bus issues)
• Incorrectly diagnosed sensor failures
• Software or firmware issues in the control modules

Common Troubleshooting Steps

When dealing with the OBD-II code U2958, 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 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 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 is receiving the correct voltage and ground. Use a multimeter to check for proper voltage at the module’s power supply pins.
• Check the ground connections to ensure they are secure and free of corrosion.
• Inspect the HPCM: If possible, check the HPCM itself for any visible signs of damage or failure. This may include checking for burnt components or water intrusion.
• Test Communication Lines: Use a scan tool to check if the HPCM is communicating with other modules in the vehicle. If other modules are also not communicating, the issue may be with the communication bus (CAN bus).
• Check the CAN bus wiring for shorts, opens, or other issues.
• Check for Software Updates: Sometimes, communication issues can be resolved with a software update. Check with the manufacturer for any available updates for the HPCM.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the modules. Reconnect and see if the code reappears.
• Scan Tool Functionality: Ensure that the scan tool you are using is compatible with the vehicle and can communicate with the HPCM. Some generic scanners may not access all modules.
• Check for Environmental Factors: Consider if there have been any recent changes to the vehicle’s environment, such as exposure to water or extreme temperatures, which could affect the HPCM.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the HPCM or communication issues for your specific vehicle make and model. Manufacturers often release TSBs for known issues.1
• Professional Diagnosis: If the issue persists after performing the above steps, it may be necessary to consult a professional technician or dealership for further diagnosis. They may have specialized tools and knowledge to address complex issues.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the U2958 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle model.