U2061 – Control Module Communication Bus Off.

The ODBII code U2061 indicates a communication issue where a control module is not able to communicate on the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2061 is moderate to severe.

Common Causes For: U2060 Control Module Communication Bus Off.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus short circuit
• Open circuit in the communication bus
• Corroded connectors
• Intermittent electrical connections
• Software issues or firmware corruption
• Low battery voltage or power supply issues
• Faulty or incompatible aftermarket components

Common misdiagnosis for U2061 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty connectors or terminals
• Battery or power supply issues
• Other communication bus faults (e.g., CAN bus issues)
• Sensor malfunctions
• Intermittent electrical connections
• Incorrectly diagnosed related DTCs (Diagnostic Trouble Codes)

Common Troubleshooting Steps

The OBD-II code U2061 indicates a communication issue on the control module communication bus, specifically that a module is “off” or not responding. This can be caused by various issues, including wiring problems, module failures, or issues with the communication bus itself. Here are some common troubleshooting steps to diagnose and resolve the U2061 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context about the issue.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors related to the control modules on the communication bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the ground connections, as poor grounding can lead to communication issues.
• Check the Control Modules: Identify the control module(s) that are part of the communication bus. This may include modules like the Engine Control Module (ECM), Transmission Control Module (TCM), Body Control Module (BCM), etc.
• If possible, perform a functional test of the modules to ensure they are operating correctly.
• Test the Communication Bus: Use a multimeter or an oscilloscope to check the voltage levels and signal integrity on the communication bus (e.g., CAN bus).
• Look for short circuits, open circuits, or abnormal voltage levels that could indicate a problem.
• Check for Interference: Ensure that there are no aftermarket devices or modifications that could be interfering with the communication bus. This includes alarms, stereo systems, or other electronic devices.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the control modules. Reconnect the battery and see if the code reappears.
• Update or Reprogram Modules: If the control module is not responding, it may need to be updated or reprogrammed. Check with the manufacturer for any available software updates.
• Replace Faulty Modules: If a specific control module is identified as faulty and not responding, it may need to be replaced.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the U2061 code for your specific vehicle make and model. Manufacturers may have known issues and recommended 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 OBD-II systems and can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the underlying issue causing the U2061 code.