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U1310 CAN Communication Bus Off

The OBD2 code U1310 indicates a communication issue on the Controller Area Network (CAN) bus, specifically that a module has gone "off" or is unable to communicate properly with other modules in the network

Definition

The OBD2 code U1310 indicates a communication issue on the Controller Area Network (CAN) bus, specifically that a module has gone "off" or is unable to communicate properly with other modules in the network

Common causes

  • 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 damaged sensors
  • Software or firmware issues in the control modules
  • Grounding issues
  • Corroded or loose connections

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad wiring or connectors
  • Defective Body Control Module (BCM)
  • Malfunctioning Transmission Control Module (TCM)
  • Issues with the Anti-lock Braking System (ABS) module
  • Battery or charging system problems
  • Faulty sensors (e.g., wheel speed sensors)
  • Incorrectly programmed or updated software
  • Grounding issues
  • Faulty CAN bus transceiver

Troubleshooting steps

  1. 1. 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

  2. 2. 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

  3. 3. Pay special attention to the connectors on the Engine Control Module (ECM), Body Control Module (BCM), and any other modules that communicate over the CAN bus

  4. 4. Test the CAN Bus Voltage

    Use a multimeter to check the voltage levels on the CAN High (CAN H) and CAN Low (CAN L) wires. The typical voltage levels should be around 2.5V when the bus is idle

  5. 5. If the voltage levels are significantly off, there may be a short circuit or an open circuit in the wiring

  6. 6. Check for Short Circuits or Open Circuits

    Use a multimeter to check for continuity in the CAN bus wiring. Look for any shorts to ground or power, as well as open circuits that could disrupt communication

  7. 7. Inspect Modules for Faults

    If the wiring appears to be in good condition, check the individual modules on the CAN bus for faults. A malfunctioning module can cause the entire bus to go offline

  8. 8. Disconnect each module one at a time and see if the code clears or if communication is restored

  9. 9. Check for Interference

    Look for any aftermarket devices or modifications that may be interfering with the CAN bus communication. This includes alarms, stereo systems, or other electronic devices

  10. 10. Perform a Network Test

    If available, use a professional scan tool to perform a network test. This can help identify which module is causing the communication issue

  11. 11. Check for Software Updates

    Sometimes, software glitches can cause communication issues. Check if there are any available updates for the vehicle's modules and apply them if necessary

  12. 12. Clear the Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with CAN bus systems and advanced diagnostic tools. By following these troubleshooting steps, you should be able to identify and resolve the issue causing the U1310 code