U2707 – Control Module Communication Bus Fault

The ODBII code U2707 indicates a communication fault on the control module communication bus, suggesting that there is a problem with data exchange between control modules in the vehicle.

The severity of ODBII code U2707 is moderate.

Common Causes For: U2706 Control Module Communication Bus Off.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Corroded terminals
• Short circuits in the communication bus
• Interference from aftermarket devices
• Software issues or bugs in the control module
• Low battery voltage or power supply issues
• Faulty communication bus (CAN, LIN, etc.)

Common misdiagnosis for U2707 U2707: Control Module Communication Bus Fault

• Faulty control module
• Wiring issues or damaged connectors
• Battery or power supply problems
• Software or firmware issues
• Grounding problems
• Intermittent communication faults
• Incorrectly diagnosed sensor failures

Common Troubleshooting Steps

The OBD-II code U2707 indicates a “Control Module Communication Bus Fault.” This code typically points to issues with the communication between various control modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide context and help identify the root cause of the communication fault.
• 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 communication bus wires (CAN bus, LIN bus, etc.) and ensure they are intact.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for continuity in the communication lines. Look for any short circuits or open circuits that could disrupt communication between modules.
• Test Control Modules: If possible, test the individual control modules for proper operation. This may involve using specialized diagnostic tools or software to communicate with each module.
• If a specific module is unresponsive, it may need to be replaced or reprogrammed.
• Inspect Ground Connections: Ensure that all ground connections for the control modules are secure and free of corrosion. Poor grounding can lead to communication issues.
• Check for Interference: Look for any aftermarket devices or modifications that may interfere with the vehicle’s communication network. This includes alarm systems, stereo systems, or other electronic devices.
• Battery and Power Supply Check: Ensure that the vehicle’s battery is in good condition and fully charged. Low voltage can cause communication issues.
• Check the power supply to the control modules to ensure they are receiving the correct voltage.
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the U2707 code. There may be known issues or recalls that could provide additional guidance.
• Seek Professional Help: If the issue persists after performing the above steps, consider seeking help from a qualified mechanic or dealership. They may have access to advanced diagnostic tools and resources. By following these troubleshooting steps, you can systematically identify and resolve the underlying issues causing the U2707 code.