WOMS
U code network Medium severity

U0290 ISO/SAE Reserved

The OBD2 code U0290 indicates a communication issue where a module is unable to communicate with another module, specifically related to a reserved ISO/SAE standard

Definition

The OBD2 code U0290 indicates a communication issue where a module is unable to communicate with another module, specifically related to a reserved ISO/SAE standard

Common causes

  • Communication issues between modules
  • Faulty wiring or connectors
  • Malfunctioning control module
  • Software or firmware issues
  • Corrupted data or signals
  • Low battery voltage or power supply issues
  • Interference from aftermarket devices or modifications

Common misdiagnoses

  • Faulty wiring or connectors
  • Malfunctioning control modules
  • Battery or power supply issues
  • Communication network problems
  • Sensor failures
  • Software glitches or updates needed
  • Incorrectly diagnosed related codes

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Addressing other codes may resolve the U0290 issue

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors related to the module that is not responding. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harnesses that connect to the affected module

  4. 4. Check Module Power and Ground

    Verify that the affected module is receiving proper power and ground. Use a multimeter to check voltage and ground continuity

  5. 5. If the module is not receiving power, trace the wiring back to the fuse box and check for blown fuses or damaged wires

  6. 6. Test the Affected Module

    If the wiring and power supply are good, the module itself may be faulty. If possible, test the module by swapping it with a known good module or using a diagnostic tool to perform a module test

  7. 7. Some modules may have specific self-diagnostic capabilities that can provide more information

  8. 8. Check for Communication Issues

    Use a scan tool to check the communication between modules. Ensure that the affected module is communicating with other modules in the network

  9. 9. Look for any communication errors or issues with the CAN (Controller Area Network) bus

  10. 10. Inspect for Short Circuits or Open Circuits

    Check for any short circuits or open circuits in the wiring harness that could be affecting communication

  11. 11. Use a multimeter to test for continuity and resistance in the wiring

  12. 12. Update Software/Firmware

    In some cases, a software update may be required for the affected module. Check with the manufacturer for any available updates

  13. 13. 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 returns

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U0290 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  15. 15. 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 issue causing the U0290 code