U2930 – Control Module Communication Bus Fault

The ODBII code U2930: Control Module Communication Bus Fault indicates a communication issue between control modules in a vehicle, suggesting that one or more modules are not properly communicating over the vehicle’s data bus.

The severity of ODBII code U2930 is moderate.

Common Causes For: U2929 Lost Communication with the Steering Angle Sensor.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Corroded terminals
• Intermittent electrical connections
• Software issues or bugs
• Faulty communication bus (CAN bus) components
• Low battery voltage or power supply issues
• Aftermarket modifications or installations affecting communication
• Environmental factors (moisture, temperature extremes)

Common misdiagnosis for U2930 U2930: Control Module Communication Bus Fault

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Battery or power supply problems
• Intermittent connection issues
• Other communication bus faults (e.g., CAN bus issues)

Common Troubleshooting Steps

The OBD-II code U2930 indicates a “Control Module Communication Bus Fault.” This code typically points to a communication issue 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 related trouble codes. Sometimes, multiple codes can provide more context about the issue.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring harnesses and connectors associated with the control modules for any signs of damage, corrosion, or loose connections.
• **Repair or Replace: If any damaged wires or connectors are found, repair or replace them as necessary.
• Check Power and Ground: Ensure that the control modules have proper power and ground connections. Use a multimeter to verify voltage and ground continuity.
• Test the Communication Bus: **CAN Bus Testing: If your vehicle uses a CAN (Controller Area Network) bus, use a CAN bus tester to check for proper communication between modules.
• **Signal Integrity: Look for any short circuits or open circuits in the communication lines.
• Inspect Control Modules: **Module Functionality: Check if the affected control module is functioning properly. If possible, swap it with a known good module to see if the issue persists.
• **Software Updates: Ensure that the control modules have the latest software updates, as manufacturers sometimes release updates to fix communication issues.
• Check for Interference: Look for any aftermarket devices or modifications that may interfere with the communication bus, such as alarms, stereo systems, or other electronic devices.
• 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 Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures related to the U2930 code and the communication bus system used in your vehicle.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U2930 code.