U2380 – Control Module Communication Bus Off.

The ODBII code U2380 indicates a communication issue where a control module is not able to communicate properly on the vehicle’s communication bus, often due to a fault in the module or wiring.

The severity of ODBII code U2380 is moderate.

Common Causes For: U2379 Control Module Communication Bus Off.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Communication bus failure
• Short circuit in the communication lines
• Corroded connectors
• Software issues or bugs
• Intermittent electrical connections
• Faulty sensors or actuators on the bus
• Battery or power supply issues

Common misdiagnosis for U2380 Control Module Communication Bus Off.

• Faulty control module
• Wiring issues
• Poor ground connections
• Corrupted software/firmware
• Faulty sensors
• Battery or power supply problems
• Intermittent connection issues
• Incorrectly installed aftermarket accessories

Common Troubleshooting Steps

The OBD-II code U2380 indicates a communication issue on the control module communication bus, specifically that a module is “off” or not communicating properly. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Other Codes: Start by scanning the vehicle for any other diagnostic trouble codes (DTCs). Other codes may provide additional context or indicate related issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with 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 which control module is reporting the U2380 code. This may require consulting the vehicle’s service manual or wiring diagrams.
• If possible, test the control module for proper operation. This may involve checking power and ground circuits, as well as communication lines.
• Test the Communication Bus:
• Use a multimeter or an oscilloscope to check the voltage levels and signal integrity on the communication bus (CAN bus, LIN bus, etc.).
• Look for any abnormal voltage levels or signals that may indicate a fault in the bus.
• Check for Short Circuits or Open Circuits:
• Use a multimeter to check for short circuits or open circuits in the communication lines. This may involve disconnecting modules and testing the wiring harnesses individually.
• Inspect for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with the communication bus. This includes things like alarm systems, stereo installations, or other electronic accessories.
• Update or Reprogram Control Modules:
• In some cases, a software update or reprogramming of the affected control module may be necessary. Check with the manufacturer for any available updates.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the codes using a scan tool and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U2380 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that could help in troubleshooting.
• Seek Professional Help:
• If the issue persists after performing the above steps, it may be necessary to consult a professional technician or dealership for further diagnosis. They may have specialized tools and knowledge to address complex communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U2380 code.