WOMS
U code network Medium severity

U1377 Invalid Data Received from Vehicle Control Module

The OBD2 code U1377 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 U1377 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)
  • Poor or damaged wiring/connectors
  • Corrupted software or firmware in the VCM
  • Communication issues between modules
  • Low battery voltage or electrical issues
  • Faulty sensors sending incorrect data
  • Interference from aftermarket devices or modifications

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)
  • Battery or power supply issues
  • Corrupted data from other modules

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 associated with the VCM and any related modules. Look for 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 for continuity in the wiring harness. Look for any short circuits or open circuits that could be causing communication issues

  7. 7. Inspect the Vehicle Control Module (VCM)

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

  9. 9. If possible, perform a software update or reset the VCM to see if that resolves the issue

  10. 10. Check for Ground Issues

  11. 11. Ensure that the VCM and other related modules have a good ground connection. Poor grounding can lead to communication errors

  12. 12. Test Other Modules

  13. 13. If the VCM is functioning properly, check other modules that communicate with it. There may be a fault in another module that is causing the invalid data

  14. 14. Perform a Network Test

  15. 15. Use a scan tool capable of performing a network test to check the communication between modules. This can help identify if a specific module is not responding correctly

  16. 16. Clear Codes and Test Drive

  17. 17. After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  18. 18. Consult Technical Service Bulletins (TSBs)

  19. 19. Check for any TSBs related to the U1377 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  20. 20. Seek Professional Help

  21. 21. 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 troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U1377 code