WOMS
U code network High severity

U1349 Network Communication Error

The OBD2 code U1349 indicates a network communication error, typically related to a malfunction in the vehicle's communication network, affecting the exchange of data between control modules

Definition

The OBD2 code U1349 indicates a network communication error, typically related to a malfunction in the vehicle's communication network, affecting the exchange of data between control modules

Common causes

  • Faulty wiring or connectors in the communication network
  • Malfunctioning control modules
  • Poor ground connections
  • Interference from aftermarket devices
  • Corroded or damaged pins in connectors
  • Software issues or bugs in the control modules
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty OBDII connector
  • Bad ground connections
  • Defective ECM (Engine Control Module)
  • Wiring issues or shorts
  • Faulty sensors
  • Corrupted software or firmware
  • Issues with other control modules
  • Battery or power supply problems

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, U1349 may be accompanied by other codes that can provide more context about the issue

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, or loose connections. Pay special attention to the CAN (Controller Area Network) bus wiring

  3. 3. Check Battery Voltage

    Ensure that the vehicle's battery is fully charged and that the voltage is within the normal range (typically 12.4 to 12.6 volts when the engine is off). Low voltage can cause communication issues

  4. 4. Inspect Ground Connections

    Verify that all ground connections are secure and free of corrosion. Poor grounding can lead to communication errors

  5. 5. Test Modules

    If you suspect a specific module is causing the issue, you can test it by checking for proper operation or by swapping it with a known good module if possible

  6. 6. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harnesses. A short can disrupt communication between modules

  7. 7. Scan for Communication Issues

    Use a professional-grade scan tool to check for communication between modules. Some tools can perform a network test to identify which module is not responding

  8. 8. Update Software/Firmware

    Check if there are any software or firmware updates available for the vehicle's modules. Sometimes, communication issues can be resolved with an update

  9. 9. Clear Codes and Test Drive

    After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

  10. 10. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics and diagnostics. By following these steps, you can systematically identify and resolve the underlying cause of the U1349 code