U2910 – Vehicle Communication Bus Malfunction

The ODBII code U2910 indicates a malfunction in the vehicle communication bus, which affects the ability of various electronic control units (ECUs) to communicate with each other.

The severity of ODBII code U2910 is moderate.

Common Causes For: U2909 Lost Communication with Vehicle Control Module.

• Faulty wiring or connectors in the communication bus
• Malfunctioning control modules
• Corrupted software or firmware in control modules
• Poor ground connections
• Short circuits or open circuits in the communication lines
• Interference from aftermarket devices
• Damaged or defective OBD-II port
• Low battery voltage or power supply issues

Common misdiagnosis for U2910 U2910: “Vehicle Communication Bus Malfunction”

• Faulty ECM (Engine Control Module)
• Defective BCM (Body Control Module)
• Bad wiring or connectors
• Malfunctioning CAN bus
• Issues with other control modules
• Battery or power supply problems
• Faulty sensors or actuators
• Software glitches or updates needed

Common Troubleshooting Steps

The OBD-II code U2910 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 the issue:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or indicate related issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the communication bus (CAN bus). Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors on the control modules, as well as any junction points in the wiring harness.
• Test the Communication Bus:
• Use a multimeter or an oscilloscope to check the voltage levels on the CAN bus wires. The typical voltage levels should be around 2.5V to 3.5V when the vehicle is on.
• Check for short circuits or open circuits in the communication lines.
• Check Control Modules:
• Ensure that all control modules are functioning properly. A malfunctioning module can disrupt communication.
• If possible, perform a reset or reprogramming of the affected modules.
• Inspect Fuses:
• Check the fuses related to the communication bus and control modules. A blown fuse can interrupt communication.
• Look for Interference:
• Check for any aftermarket devices or modifications that may interfere with the communication bus, such as alarms, stereo systems, or other electronic devices.
• Perform a Network Test:
• Some advanced scan tools can perform a network test to check the integrity of the communication bus and identify any modules that are not responding.
• Update Software/Firmware:
• Ensure that the vehicle’s control modules have the latest software or firmware updates. Sometimes, manufacturers release updates to fix communication issues.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented known issues and solutions.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U2910 code.