U2310 – CAN Communication Bus Off.

The ODBII code U2310 indicates a communication issue on the Controller Area Network (CAN) bus, specifically that a device has gone “off” or is not responding, which can disrupt data transmission between modules.

The severity of ODBII code U2310 CAN Communication Bus Off is moderate to high.

Common Causes For: U2309 Control Module Communication Bus Off.

• Faulty CAN bus wiring or connectors
• Defective CAN bus module
• Short circuit in the CAN bus
• Open circuit in the CAN bus
• Interference from other electrical components
• Low battery voltage
• Faulty or incompatible aftermarket accessories
• Software or firmware issues in the control modules
• Grounding issues
• Corroded or damaged terminals

Common misdiagnosis for U2310 CAN Communication Bus Off.

• Faulty Engine Control Module (ECM)
• Bad wiring or connectors
• Defective Body Control Module (BCM)
• Malfunctioning Transmission Control Module (TCM)
• Issues with the power supply or ground connections
• Faulty sensors or actuators
• Incorrectly configured or programmed modules
• Problems with the CAN bus termination resistors

Common Troubleshooting Steps

The OBD-II code U2310 indicates a problem with the CAN (Controller Area Network) communication bus, specifically that the bus is “off.” This can lead to communication issues between various modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve the U2310 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide context and help identify the root cause of the issue.
• Inspect the Wiring and Connectors: Visually inspect the wiring and connectors associated with the CAN bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors at the ECM (Engine Control Module) and other modules on the CAN bus.
• Test the CAN Bus Voltage: Use a multimeter to check the voltage levels on the CAN High and CAN Low wires. The typical voltage levels should be around 2.5V when the bus is idle.
• If the voltage levels are significantly off, there may be a short circuit or an open circuit in the wiring.
• Check for Short Circuits: Inspect the CAN bus wiring for any short circuits to ground or to each other. This can cause the bus to go “off.”
• Examine the Modules: Check the modules connected to the CAN bus for proper operation. A malfunctioning module can disrupt communication.
• If possible, disconnect modules one at a time to see if the code clears or communication is restored.
• Test the Termination Resistors: Ensure that the CAN bus has the correct termination resistors (typically 120 ohms) at both ends of the bus. A missing or faulty resistor can cause communication issues.
• Check for Interference: Look for sources of electrical interference that may be affecting the CAN bus communication. This can include aftermarket accessories or modifications.
• Inspect the Battery and Ground Connections: Ensure that the vehicle’s battery is in good condition and that all ground connections are secure. Poor grounding can lead to communication issues.
• Perform a Network Test: If available, use a specialized scan tool to perform a network test to check the integrity of the CAN bus and identify any faults.
• Clear the Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1
• Consult a Professional: If the issue persists after performing these steps, it may be necessary to consult a professional technician or a dealership for further diagnosis. By following these troubleshooting steps, you can systematically identify and resolve the issue causing the U2310 code.