WOMS
U code network Medium severity

U046F Invalid Data Received from Vehicle Control Module

The OBD2 code U046F indicates that the vehicle's control module has received invalid or corrupted data from another control module in the vehicle

Definition

The OBD2 code U046F indicates that the vehicle's control module has received invalid or corrupted data from another control module in the vehicle

Common causes

  • Faulty Vehicle Control Module (VCM)
  • Corrupted software or firmware in the VCM
  • Poor or damaged wiring/connectors in the communication circuit
  • Faulty sensors sending incorrect data
  • Issues with the OBDII port or scanner
  • Interference from aftermarket devices or modifications
  • Low battery voltage or electrical issues in the vehicle
  • Communication protocol mismatch between modules

Common misdiagnoses

  • Faulty Vehicle Control Module (VCM)
  • Wiring issues or short circuits
  • Faulty sensors (e.g., ABS, engine, transmission)
  • Communication issues between modules
  • Battery or power supply problems
  • Corrupted software or firmware in modules
  • Faulty diagnostic tools or incorrect readings

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 related to the control modules involved. Look for signs of damage, corrosion, or loose connections that could affect communication

  3. 3. Verify Module Functionality

    Ensure that the control module that is reporting the U046F code is functioning correctly. This may involve checking for proper operation of the module and its associated sensors

  4. 4. Check for Software Updates

    Sometimes, the issue can be resolved by updating the software of the affected control module. Check with the manufacturer for any available updates

  5. 5. Perform a Network Scan

    Use a scan tool capable of performing a network scan to check for communication issues between modules. This can help identify if other modules are also experiencing problems

  6. 6. Inspect the CAN Bus

    If your vehicle uses a Controller Area Network (CAN) bus, check for issues with the bus itself. Look for shorts, opens, or other faults in the wiring

  7. 7. Clear Codes and Test Drive

    After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  8. 8. Check Power and Ground

    Ensure that the control module has proper power and ground connections. A weak or intermittent power supply can cause communication issues

  9. 9. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of your vehicle. Manufacturers may have issued guidance on common issues related to U046F

  10. 10. Replace the Control Module

    If all else fails and the control module is determined to be faulty, it may need to be replaced. Ensure that the new module is properly programmed and calibrated. 1

  11. 11. Seek Professional Help

    If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or dealership that has experience with your vehicle's make and model. By following these steps, you can systematically diagnose and address the cause of the U046F code