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U1572U1572: "Vehicle Communication Network Malfunction

The OBD2 code U1572 indicates a malfunction in the vehicle communication network, which may affect the ability of various modules to communicate with each other

Definition

The OBD2 code U1572 indicates a malfunction in the vehicle communication network, which may affect the ability of various modules to communicate with each other

Common causes

  • Faulty wiring or connectors in the communication network
  • Malfunctioning control modules
  • Corrupted software or firmware in the modules
  • Poor ground connections
  • Interference from aftermarket devices
  • Damaged or shorted communication lines
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control modules
  • Incorrectly programmed modules
  • Battery or power supply issues
  • Faulty sensors
  • Software glitches
  • Grounding issues
  • Intermittent communication faults

Troubleshooting steps

  1. 1.Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the problem

  2. 2.Inspect Wiring and Connectors

  3. 3.Visually inspect the wiring and connectors associated with the communication network. Look for damaged, frayed, or corroded wires and loose connections

  4. 4.Pay special attention to the connectors on the modules involved in the communication network

  5. 5.Check for Short Circuits

  6. 6.Use a multimeter to check for short circuits in the wiring harness. Ensure that there are no unintended connections between wires that could disrupt communication

  7. 7.Test Modules

  8. 8.If you suspect a specific module (like the Body Control Module, Engine Control Module, etc.) is causing the issue, you can test it for proper operation. This may involve checking power and ground connections, as well as communication signals

  9. 9.Inspect the CAN Bus

  10. 10.The Controller Area Network (CAN) bus is responsible for communication between modules. Check for proper voltage levels on the CAN bus wires. Typically, you should see around 2.5V on the CAN High and CAN Low lines when the vehicle is on

  11. 11.Check for Interference

  12. 12.Look for any aftermarket devices or modifications that may interfere with the vehicle's communication network. This includes alarm systems, stereo systems, or other electronic devices

  13. 13.Update Software/Firmware

  14. 14.Sometimes, a software update for the vehicle's modules can resolve communication issues. Check with the manufacturer or a dealership for any available updates

  15. 15.Perform a Hard Reset

  16. 16.Disconnect the vehicle's battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears

  17. 17.Consult Technical Service Bulletins (TSBs)

  18. 18.Check for any TSBs related to the U1572 code for your specific vehicle make and model. Manufacturers may have identified common issues and solutions

  19. 19.Professional Diagnosis

  20. 20.If the issue persists after performing the above steps, it may be necessary to seek help from a professional mechanic or dealership. They have specialized tools and knowledge to diagnose complex communication issues. By following these steps, you can systematically identify and address the underlying cause of the U1572 code