U2198 – Lost Communication with the Hybrid Powertrain Control Module (HPCM).

The ODBII code U2198 indicates that there is a communication failure between the vehicle’s onboard computer and the Hybrid Powertrain Control Module (HPCM), which may affect the operation of the hybrid system.

The severity of ODBII code U2198 is generally considered moderate to severe.

Common Causes For: U2197 U2197: “Control Module Communication Fault”

• Faulty Hybrid Powertrain Control Module (HPCM)
• Damaged or corroded wiring or connectors
• Poor ground connections
• Failed communication network (CAN bus issues)
• Blown fuses
• Software or firmware issues
• Battery or power supply problems
• Faulty sensors related to the hybrid system

Common misdiagnosis for U2198 Lost Communication with the Hybrid Powertrain Control Module (HPCM)”.

• Faulty Hybrid Powertrain Control Module (HPCM)
• Wiring issues or damaged connectors
• Faulty Engine Control Module (ECM)
• Battery management system problems
• Communication network issues (CAN bus)
• Faulty sensors related to the hybrid system
• Power supply issues to the HPCM
• Software or firmware issues in the HPCM or ECM

Common Troubleshooting Steps

When dealing with the OBD-II code U2198, which indicates “Lost Communication with the Hybrid Powertrain Control Module (HPCM),” 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 trouble codes that may be present. Codes related to the HPCM or other modules can provide additional context.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with 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: **Power Supply: Verify that the HPCM is receiving the correct voltage. Use a multimeter to check the power supply to the module.
• **Ground Connections: Ensure that the ground connections for the HPCM are secure and free of corrosion.
• Inspect the HPCM: If accessible, check the HPCM for any physical damage or signs of water intrusion.
• If the module is removable, consider reseating it to ensure a good connection.
• Check Communication Lines: Use a scan tool to check if other modules in the vehicle can communicate with the HPCM. If other modules are also unresponsive, there may be a communication network issue.
• Inspect the CAN (Controller Area Network) bus wiring for shorts, opens, or other issues.
• Test the HPCM: If possible, perform a functional test of the HPCM using a scan tool. Some tools can perform specific tests or commands to see if the module responds.
• If you have access to a known good HPCM, consider swapping it to see if the issue resolves.
• Check for Software Updates: Verify if there are any software updates available for the HPCM or the vehicle’s control modules. Sometimes, communication issues can be resolved with a software update.
• Inspect Related Components: Check other components that may interact with the HPCM, such as the battery, inverter, or other hybrid system components, for faults.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble 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
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional technician or a dealership with specialized diagnostic equipment. By following these steps, you can systematically diagnose and address the U2198 code. Always ensure safety precautions are taken when working on hybrid vehicles, as they contain high-voltage components.