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U1910 CAN Communication Bus Fault

The OBD2 code U1910 indicates a fault in the CAN (Controller Area Network) communication bus, suggesting a problem with data transmission between modules in the vehicle's network

Definition

The OBD2 code U1910 indicates a fault in the CAN (Controller Area Network) communication bus, suggesting a problem with data transmission between modules in the vehicle's 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
  • Poor ground connections
  • Faulty or incompatible aftermarket accessories
  • Software issues or bugs in the vehicle's control modules

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Defective Body Control Module (BCM)
  • Bad wiring or connectors
  • Malfunctioning sensors
  • Issues with the powertrain control module (PCM)
  • Battery or charging system problems
  • Faulty CAN bus transceiver
  • Incorrectly programmed modules

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 additional context for the issue

  2. 2. Inspect the Wiring and Connectors

  3. 3. Visually inspect the wiring harnesses and connectors associated with the CAN bus. Look for signs of damage, corrosion, or loose connections

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

  5. 5. Test the CAN Bus Voltage

  6. 6. 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 idle and should vary when data is being transmitted

  7. 7. If the voltage levels are outside the expected range, there may be a fault in the wiring or a module

  8. 8. Check for Short Circuits or Open Circuits

  9. 9. Use a multimeter to check for continuity in the CAN bus wiring. Look for any short circuits to ground or power, as well as open circuits that may interrupt communication

  10. 10. Inspect Modules

  11. 11. If the wiring and connectors appear to be in good condition, the issue may lie with one of the modules on the CAN bus. Disconnect each module one at a time and check if the code clears or if communication is restored

  12. 12. If a specific module is found to be causing the issue, it may need to be repaired or replaced

  13. 13. Check for Interference

  14. 14. Ensure that there are no aftermarket devices or modifications that could be interfering with the CAN bus communication. This includes things like alarm systems, stereo systems, or other electronic devices

  15. 15. Scan for Module Communication

  16. 16. Use a scan tool to check if all modules on the CAN bus are communicating properly. If some modules are not responding, it may indicate a problem with those specific modules

  17. 17. Perform a Network Test

  18. 18. Some advanced scan tools have the capability to perform a network test to check the integrity of the CAN bus. This can help identify issues that may not be visible through visual inspection

  19. 19. Check for Software Updates

  20. 20. In some cases, a software update for the vehicle’s modules may resolve communication issues. Check with the manufacturer for any available updates

  21. 21. Refer to the vehicle’s service manual for specific diagnostic procedures related to the CAN bus and U1910 code. This can provide additional insights and steps tailored to your vehicle model. If these steps do not resolve the issue, it may be necessary to consult a professional technician or automotive specialist for further diagnosis and repair