WOMS
U code network Medium severity

U1564 U1564: "Module Communication Failure

The OBD2 code U1564 indicates a communication failure between modules in the vehicle's network, suggesting that one or more electronic control units (ECUs) are unable to communicate properly with each other

Definition

The OBD2 code U1564 indicates a communication failure between modules in the vehicle's network, suggesting that one or more electronic control units (ECUs) are unable to communicate properly with each other

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning module
  • Corroded or damaged connectors
  • Poor ground connections
  • Intermittent electrical issues
  • Software or firmware issues
  • 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 unrelated module failures

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

    Examine the wiring and connectors associated with the affected modules. Look for signs of damage, corrosion, loose connections, or broken wires. Pay special attention to ground connections

  3. 3. Check Power Supply

    Ensure that the affected module is receiving the proper voltage and ground. Use a multimeter to check the power and ground circuits

  4. 4. Inspect Modules

    If the code points to a specific module, inspect that module for physical damage or signs of water intrusion. If possible, test the module in another vehicle to confirm its functionality

  5. 5. Clear Codes and Test Drive

    Clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive. Sometimes, the issue may be temporary, and clearing the codes can help determine if the problem persists

  6. 6. Check for Software Updates

    Some communication issues can be resolved with software updates. Check with the vehicle manufacturer or a dealership to see if there are any updates available for the affected modules

  7. 7. Perform a Network Test

    If the vehicle has multiple modules, perform a network test to check for communication between them. This may require specialized diagnostic equipment

  8. 8. Look for Interference

    Sometimes, aftermarket accessories or modifications can interfere with module communication. If any modifications have been made, consider removing them to see if the issue resolves

  9. 9. Consult Wiring Diagrams

    Refer to the vehicle's wiring diagrams to understand the communication network and identify any potential issues in the communication lines

  10. 10. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1564 code