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U1342 Module Communication Failure

The OBD2 code U1342 indicates a communication failure between modules in the vehicle's network, suggesting that one or more control modules are not communicating properly with each other

Definition

The OBD2 code U1342 indicates a communication failure between modules in the vehicle's network, suggesting that one or more control modules are not communicating properly with each other

Common causes

  • Faulty wiring or connectors
  • Failed control module
  • Corrupted software or firmware
  • Poor ground connections
  • Interference from aftermarket devices
  • Low battery voltage
  • Communication network issues (e.g., CAN bus problems)

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Software issues or updates needed
  • Battery or power supply problems
  • Grounding issues
  • Intermittent communication issues
  • Other module failures (e.g., ABS, BCM)
  • Corrupted data or configuration errors

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to ground connections, as poor grounding can lead to communication issues

  5. 5. Check Power Supply

  6. 6. Ensure that the affected module is receiving the proper voltage. Use a multimeter to check the power supply to the module

  7. 7. Verify that the fuses related to the module are intact and functioning

  8. 8. Reset the Modules

  9. 9. Clear the trouble codes using an OBD-II scanner and see if the code returns after a short drive. Sometimes, a temporary glitch can cause communication issues

  10. 10. Inspect the CAN Bus

  11. 11. If your vehicle uses a Controller Area Network (CAN) bus for communication, check for any faults in the bus wiring. Look for shorts, opens, or damaged segments in the wiring harness

  12. 12. Use a CAN bus diagnostic tool if available to check for communication errors

  13. 13. Check for Software Updates

  14. 14. Some manufacturers release software updates for their modules. Check if there are any updates available for the affected module(s) and apply them if necessary

  15. 15. Test the Affected Module

  16. 16. If the above steps do not resolve the issue, the affected module may be faulty. Consider testing or replacing the module to see if that resolves the communication failure

  17. 17. Consult Technical Service Bulletins (TSBs)

  18. 18. Look for any TSBs related to the specific make and model of your vehicle. Manufacturers may have documented common issues and solutions for specific models

  19. 19. Professional Diagnosis

  20. 20. If you are unable to resolve the issue, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle's specific systems. By following these steps, you should be able to identify and potentially resolve the communication failure indicated by the U1342 code