U2272 – Control Module Communication Bus Off.

The ODBII code U2272 indicates a communication issue where a control module is unable to communicate on the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2272 is moderate to severe.

Common Causes For: U2270 U2270: Control Module Communication Bus Fault

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Short circuits in the communication lines
• Corroded connectors
• Software issues or bugs
• Interference from aftermarket devices
• Low battery voltage or power supply issues
• Faulty CAN bus transceiver
• Open circuit in the communication bus

Common misdiagnosis for U2272 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 errors
• Sensor malfunctions

Common Troubleshooting Steps

The OBD-II code U2272 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 configuration issues. Here are some common troubleshooting steps to diagnose and resolve the U2272 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 Power Supply: Ensure that the affected control module is receiving the proper voltage. Use a multimeter to check the power supply to the module.
• Verify that the fuses related to the control modules are intact.
• Test the Control Module: If possible, perform a functional test of the control module that is reporting the U2272 code. This may involve using specialized diagnostic equipment.
• If the module is not responding, it may need to be replaced or reprogrammed.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for short circuits or open circuits in the communication lines (CAN bus, LIN bus, etc.).
• Inspect the bus lines for any signs of damage or wear.
• Verify Communication Between Modules: Use a scan tool to check if other modules on the communication bus are functioning correctly. If other modules are also not communicating, the issue may be with the bus itself.
• If only one module is affected, focus on that specific module.
• Check for Software Updates: Check if there are any software updates available for the control modules. Sometimes, communication issues can be resolved with a software update.
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes 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 specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to communication bus problems.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician with experience in automotive electronics and diagnostics. By following these steps, you should be able to identify and resolve the underlying issue causing the U2272 code.