WOMS
U code network High severity

U1592 Lost Communication with the Body Control Module (BCM) - Bus Off

The OBD2 code U1592 indicates that there is a communication failure between the vehicle's control modules, specifically indicating that the Body Control Module (BCM) is not responding or is offline, often due to a bus...

Definition

The OBD2 code U1592 indicates that there is a communication failure between the vehicle's control modules, specifically indicating that the Body Control Module (BCM) is not responding or is offline, often due to a bus communication issue

Common causes

  • Faulty Body Control Module (BCM)
  • Damaged wiring or connectors
  • Short circuit in the communication lines
  • Faulty or corroded ground connections
  • Issues with the CAN bus system
  • Malfunctioning power supply to the BCM
  • Software or firmware issues in the BCM
  • Other modules on the bus malfunctioning

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or shorts in the communication lines
  • Faulty or corroded connectors
  • Issues with the power supply to the BCM
  • Faulty Instrument Cluster
  • Problems with the Engine Control Module (ECM)
  • Malfunctioning CAN bus system
  • Software or firmware issues in the BCM
  • Grounding issues in the electrical system
  • Faulty sensors or actuators connected to the BCM

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the BCM for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or damaged

  4. 4. Check the BCM

    Power and Ground: Verify that the BCM is receiving proper power and ground. Use a multimeter to check voltage at the BCM connector

  5. 5. Module Functionality

    If possible, test the BCM in another vehicle or replace it with a known good unit to see if the problem persists

  6. 6. Inspect the CAN Bus

    Bus Communication: The BCM communicates over the Controller Area Network (CAN) bus. Check for proper communication between the BCM and other modules

  7. 7. Termination Resistors

    Ensure that the CAN bus has the correct termination resistors in place and that they are functioning properly

  8. 8. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring harness that could be causing communication issues

  9. 9. Scan for Communication Issues

    Use a professional scan tool to monitor the communication on the CAN bus. Look for any irregularities or interruptions in communication between modules

  10. 10. Inspect for Environmental Factors

    Check for any environmental factors that could affect the BCM, such as moisture or extreme temperatures

  11. 11. Reset the System

    Clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive. Sometimes, a reset can resolve temporary communication issues

  12. 12. Check for Software Updates

    Verify if there are any software updates available for the BCM or other related modules. Sometimes, manufacturers release updates to fix known issues

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U1592 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known fixes.1

  14. 14. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing BCM and communication issues. By following these steps, you should be able to identify the root cause of the U1592 code and take appropriate action to resolve the issue