WOMS
U code network Medium severity

U2749 Invalid Data Received from Vehicle Control Module

The OBD2 code U2749 indicates that the vehicle's control module has received invalid or corrupted data from another control module, leading to communication issues within the vehicle's network

Definition

The OBD2 code U2749 indicates that the vehicle's control module has received invalid or corrupted data from another control module, leading to communication issues within the vehicle's network

Common causes

  • Faulty Vehicle Control Module (VCM)
  • Corrupted or damaged wiring harness
  • Poor electrical connections
  • Faulty sensors or actuators
  • Software issues or bugs in the VCM
  • Interference from aftermarket devices
  • Low battery voltage or power supply issues
  • Faulty communication lines (CAN bus issues)

Common misdiagnoses

  • Faulty Vehicle Control Module (VCM)
  • Wiring issues or shorts in the communication lines
  • Faulty sensors or actuators
  • Incorrectly programmed or updated software
  • Issues with the Engine Control Module (ECM)
  • Problems with the Transmission Control Module (TCM)
  • Corrupted data from other modules
  • Battery or power supply issues affecting module communication

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 vehicle control module and any related modules. Look for signs of damage, corrosion, loose connections, or frayed wires

  3. 3. Check for Software Updates

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

  4. 4. Inspect the Control Module

    If the wiring and connectors are in good condition, the control module itself may be faulty. Check for any signs of physical damage or water intrusion

  5. 5. Test the Control Module

    If possible, test the control module using a scan tool that can communicate with it. Check for any abnormal readings or responses

  6. 6. Check Power and Ground

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

  7. 7. Look for Interference

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

  8. 8. Perform a Hard Reset

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

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U2749 code for your specific vehicle make and model. Manufacturers may have documented common issues and fixes

  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 your vehicle's specific systems. By following these steps, you should be able to identify the root cause of the U2749 code and take appropriate action to resolve it