U2197 – Control Module Communication Fault

The ODBII code U2197 indicates a “Control Module Communication Fault,” meaning there is a problem with communication between the vehicle’s control modules, which may affect their ability to share data and function properly.

The severity of ODBII code U2197 is moderate.

Common Causes For: U2196 U2196: Body Control Module Communication Failure

• Faulty control module
• Poor electrical connections
• Damaged wiring or harness
• Corroded connectors
• Software issues or bugs
• Low battery voltage
• Interference from aftermarket devices
• Faulty CAN bus communication
• Grounding issues

Common misdiagnosis for U2197 U2197: “Control Module Communication Fault”

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty connectors or terminals
• Battery or charging system problems
• Intermittent communication issues
• Other communication fault codes misinterpretation

Common Troubleshooting Steps

The OBD-II code U2197 indicates a “Control Module Communication Fault.” This code typically means that there is a communication issue between the vehicle’s control modules. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide more context about the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors related to the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the affected modules.
• Check Power and Ground:
• Ensure that the control modules have proper power and ground connections. Use a multimeter to check voltage and ground continuity.
• If there is a power or ground issue, repair the wiring or connections as needed.
• Test Control Modules:
• If possible, test the affected control modules to ensure they are functioning correctly. This may involve using specialized diagnostic tools or software.
• If a module is found to be faulty, it may need to be repaired or replaced.
• Inspect the CAN Bus:
• The Controller Area Network (CAN) bus is responsible for communication between control modules. Check for any issues with the CAN bus wiring or connections.
• Use a scan tool to monitor the CAN bus for any irregularities or communication failures.
• Check for Software Updates:
• Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the control modules.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the vehicle’s performance and any warning lights.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on known issues and fixes.
• Seek Professional Help:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. By following these troubleshooting steps, you can systematically identify and resolve the communication fault associated with the U2197 code.