U2245 – Vehicle Communication Bus Malfunction

The ODBII code U2245: Vehicle Communication Bus Malfunction indicates a problem with the communication network between various vehicle control modules, which may affect their ability to exchange data properly.

The severity of ODBII code **U2245: Vehicle Communication Bus Malfunction** is generally considered moderate to severe.

Common Causes For: U2232: CAN Bus Communication Fault

• Faulty wiring or connectors in the communication bus.
• Malfunctioning control modules.
• Corroded or damaged terminals.
• Short circuits in the communication lines.
• 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 U2245: Vehicle Communication Bus Malfunction

• Faulty OBDII connector
• Bad ground connections
• Defective ECM (Engine Control Module)
• Malfunctioning BCM (Body Control Module)
• Wiring issues or shorts in the communication lines
• Faulty sensors or actuators
• Incorrectly programmed or updated software
• Issues with other communication modules (e.g., ABS, TCM)
• Battery or power supply problems
• Corroded or damaged connectors

Common Troubleshooting Steps

The OBD-II code **U2245: Vehicle Communication Bus Malfunction** indicates a problem with the communication between various control modules in the vehicle. This can be caused by issues with wiring, connectors, or the modules themselves. 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 on the modules that are part of the communication network.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring harness. Ensure that the communication lines are not shorted to ground or to each other.
• Test the Modules:
• If possible, test the control modules involved in the communication bus. This may involve checking for proper operation or replacing a suspected faulty module.
• Check for Ground Issues:
• Ensure that all ground connections are secure and free of corrosion. Poor grounding can lead to communication issues.
• Inspect the CAN Bus:
• If your vehicle uses a Controller Area Network (CAN) bus, check the CAN bus lines for continuity and resistance. The resistance should typically be around 60 ohms between the CAN high and CAN low lines.
• Look for Interference:
• Check for any aftermarket devices or modifications that may interfere with the vehicle’s communication systems. This includes alarms, stereo systems, or other electronic devices.
• Update Software/Firmware:
• In some cases, updating the software or firmware of the vehicle’s control modules may resolve communication issues.
• 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 U2245 code for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations. 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 your vehicle’s specific systems. By following these troubleshooting steps, you can identify and potentially resolve the underlying cause of the U2245 code.