U2384 – Vehicle Communication Bus Malfunction

The ODBII code U2384: Vehicle Communication Bus Malfunction indicates a problem with the communication network between various control modules in the vehicle, which may affect their ability to exchange data properly.

The severity of ODBII code U2384 is generally considered moderate to severe.

Common Causes For: U2383 Invalid Data Received from Vehicle Dynamics Control Module.

• Faulty wiring or connectors in the communication bus
• Malfunctioning control modules
• Corroded or damaged terminals
• Short circuits in the wiring harness
• Interference from aftermarket devices
• Software issues or bugs in the control modules
• Poor ground connections
• Low battery voltage or power supply issues

Common misdiagnosis for U2384 U2384: Vehicle Communication Bus Malfunction

• Faulty Engine Control Module (ECM)
• Defective Body Control Module (BCM)
• Wiring issues or shorts in the communication bus
• Faulty sensors or actuators
• Corrupted software or firmware in control modules
• Battery or power supply issues
• Poor ground connections
• Faulty diagnostic connector or interface
• Intermittent communication issues due to environmental factors
• Other communication bus-related codes being misinterpreted.

Common Troubleshooting Steps

The OBD-II code U2384 indicates a “Vehicle Communication Bus Malfunction.” 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 Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the communication bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors for the modules involved in the communication bus.
• Check 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.).
• Ensure that the bus is receiving the correct voltage and that the signals are within the expected range.
• Test Control Modules: If you suspect a specific control module is causing the issue, you can test it by disconnecting it and checking if the code persists.
• If the code clears after disconnecting a module, that module may be faulty.
• Inspect for Short Circuits: Check for any short circuits in the wiring that could be causing interference with the communication signals.
• Look for pinched wires or damaged insulation that could lead to shorts.
• Check for Ground Issues: Ensure that all ground connections related to the control modules are secure and free of corrosion.
• A poor ground can lead to communication issues.
• Update or Reprogram Modules: In some cases, a software update or reprogramming of the control modules may be necessary to resolve communication issues.
• Check with the manufacturer for any available updates.
• Inspect for Interference: Look for any aftermarket devices or modifications that may be interfering with the vehicle’s communication systems.
• Remove or disconnect any non-factory equipment to see if the issue resolves.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the control modules. Reconnect and see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of your vehicle. Manufacturers may have issued guidance on known issues with the communication bus.1
• 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 vehicle communication systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U2384 code.