U2207 – Control Module Communication Fault

The ODBII code U2207 indicates a communication fault between control modules in a vehicle, suggesting that one or more modules are unable to communicate properly with each other.

The severity of ODBII code U2207 is moderate.

Common Causes For: U2206 U2206: “Module Communication Failure”

• Faulty wiring or connectors
• Failed control module
• Corrupted software or firmware
• Poor ground connections
• Intermittent electrical issues
• Communication network issues (e.g., CAN bus problems)
• Short circuits or open circuits in the communication lines
• Incompatible or malfunctioning aftermarket components

Common misdiagnosis for U2207 U2207: “Control Module Communication Fault”

• Faulty control module
• Wiring issues or damaged connectors
• Corrupted software or firmware in the control module
• Battery or power supply problems
• Grounding issues
• Faulty communication lines (CAN bus issues)
• Intermittent electrical connections
• Other unrelated control module faults

Common Troubleshooting Steps

The OBD-II code U2207 indicates a “Control Module Communication Fault.” This code typically means that there is a problem with communication 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 other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the control modules. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect the modules, as these can be prone to wear and tear.
• Check Power and Ground:
• Ensure that the control modules have the proper power supply and ground connections. Use a multimeter to check for voltage and continuity.
• If a module is not receiving power or ground, trace the wiring back to the source to identify any issues.
• Test Control Modules:
• If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve using specialized diagnostic tools or swapping with a known good module.
• Some modules may have self-diagnostic capabilities that can provide additional information.
• Inspect the CAN Bus:
• The Controller Area Network (CAN) bus is responsible for communication between control modules. Check for any faults in the CAN bus wiring, such as shorts or opens.
• Use an oscilloscope or CAN bus diagnostic tool to monitor the communication signals on the bus.
• 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 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 U2207 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2207 code.