WOMS
U code network Medium severity

U0446 Invalid Data Received From Body Control Module "E

The OBD2 code U0446 indicates that the vehicle's control module has received invalid or corrupted data from the Body Control Module "E."

Definition

The OBD2 code U0446 indicates that the vehicle's control module has received invalid or corrupted data from the Body Control Module "E."

Common causes

  • Faulty Body Control Module (BCM)
  • Corrupted software or firmware in the BCM
  • Poor electrical connections or wiring issues
  • Short circuits or open circuits in the communication lines
  • Faulty or damaged sensors or components connected to the BCM
  • Issues with the vehicle's power supply or grounding
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or shorts in the communication lines
  • Faulty Instrument Cluster
  • Incorrectly programmed or updated BCM
  • Faulty or incompatible aftermarket accessories
  • Issues with other control modules (e.g., PCM, TCM)
  • Corrupted software or firmware in the BCM
  • Poor ground connections or power supply issues

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 Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors between the ECM and BCM for any signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely plugged in and that there are no bent pins

  5. 5. Check for Short Circuits or Open Circuits

  6. 6. Use a multimeter to test the wiring for continuity and to check for any short circuits or open circuits that could be affecting communication between the ECM and BCM

  7. 7. Inspect the Body Control Module

  8. 8. If the wiring and connectors appear to be in good condition, the BCM itself may be faulty. Check for any signs of physical damage or water intrusion

  9. 9. If possible, test the BCM in another vehicle to see if it functions correctly

  10. 10. Check for Software Updates

  11. 11. Sometimes, the issue can be resolved with a software update. Check with the manufacturer or a dealership to see if there are any available updates for the ECM or BCM

  12. 12. Perform a Hard Reset

  13. 13. Disconnect the vehicle's battery for a few minutes to reset the ECM and BCM. Reconnect the battery and see if the code reappears

  14. 14. Scan for Communication Issues

  15. 15. Use a professional-grade scan tool to check for communication issues on the CAN bus. This can help identify if there are problems with other modules that may be affecting communication

  16. 16. Check for Ground Issues

  17. 17. Ensure that the BCM and ECM have a good ground connection. Poor grounding can lead to communication errors

  18. 18. Consult Technical Service Bulletins (TSBs)

  19. 19. Check for any TSBs related to the U0446 code for your specific make and model. Manufacturers may have known fixes or recommendations for this issue

  20. 20. Seek Professional Help

  21. 21. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your vehicle's specific systems. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U0446 code