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U1358 U1358: "Control Module Communication Failure

The OBD2 code U1358 indicates a "Control Module Communication Failure," which means there is a problem with the communication between various control modules in the vehicle, potentially affecting their ability to...

Definition

The OBD2 code U1358 indicates a "Control Module Communication Failure," which means there is a problem with the communication between various control modules in the vehicle, potentially affecting their ability to exchange data properly

Common causes

  • Faulty control module
  • Poor electrical connections
  • Damaged wiring harness
  • Corroded connectors
  • Software issues or bugs
  • Low battery voltage
  • Interference from aftermarket devices
  • Faulty CAN bus communication
  • Grounding issues

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Faulty sensors
  • Battery or charging system problems
  • Intermittent connection issues
  • Communication network failures (CAN bus issues)

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 communication failure

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harnesses and connectors associated with the control modules for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    Repair any damaged wires or connectors and ensure that all connections are secure

  4. 4. Check Power and Ground

    Power Supply: Verify that the control modules are receiving the correct voltage. Use a multimeter to check the power supply to the affected modules

  5. 5. Ground Connections

    Ensure that all ground connections are clean and secure. Poor grounding can lead to communication issues

  6. 6. Inspect Control Modules

    Module Functionality: If possible, test the affected control module(s) to ensure they are functioning correctly. This may involve swapping with a known good module if available

  7. 7. Software Updates

    Check if there are any software updates available for the control modules. Sometimes, manufacturers release updates to fix communication issues

  8. 8. Check for Interference

    Aftermarket Accessories: If any aftermarket accessories (like alarms, radios, or other electronic devices) have been installed, they may interfere with communication. Temporarily disconnect them to see if the issue resolves

  9. 9. Perform a Network Test

    CAN Bus Testing: If your vehicle uses a Controller Area Network (CAN) bus, use a scan tool capable of performing a network test to check for communication errors between modules

  10. 10. Signal Integrity

    Check for proper signal integrity on the CAN bus lines. Look for short circuits, open circuits, or noise on the lines

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's specific systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1358 code