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U code network Medium severity

U1107 SCP (J1850) Invalid or Missing Data for Legislated Diagnostics

The OBD2 code U1107 SCP (J1850) indicates that there is invalid or missing data related to legislated diagnostics, typically due to communication issues between modules in the vehicle's network

Definition

The OBD2 code U1107 SCP (J1850) indicates that there is invalid or missing data related to legislated diagnostics, typically due to communication issues between modules in the vehicle's network

Common causes

  • Faulty communication between modules
  • Damaged or corroded wiring or connectors
  • Malfunctioning or missing control module
  • Software issues or programming errors
  • Low battery voltage or power supply issues
  • Interference from aftermarket devices or modifications
  • Poor ground connections

Common misdiagnoses

  • Faulty OBDII connector
  • Bad ground connections
  • Malfunctioning ECM/PCM
  • Wiring issues or shorts
  • Corrupted software or firmware
  • Faulty sensors unrelated to the code
  • Battery or power supply issues
  • Communication issues with 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. Addressing related codes can help in diagnosing the root cause

  2. 2. Inspect the Vehicle’s Wiring and Connectors

    Visual Inspection: Look for damaged, frayed, or corroded wiring and connectors related to the SCP (J1850) communication lines

  3. 3. Connector Integrity

    Ensure that all connectors are securely attached and free of corrosion

  4. 4. Test the SCP Communication Lines

    Use a multimeter or an oscilloscope to check the voltage and signal integrity on the SCP communication lines. Look for proper voltage levels and signal patterns

  5. 5. Check for short circuits or open circuits in the wiring

  6. 6. Check the Modules

    Verify that all modules on the SCP network are functioning correctly. A malfunctioning module can disrupt communication

  7. 7. If possible, perform a module reset or reprogramming if the manufacturer provides such procedures

  8. 8. Inspect the Power and Ground Connections

    Ensure that all relevant modules have proper power and ground connections. Poor power supply can lead to communication issues

  9. 9. Look for Software Updates

    Check if there are any software updates available for the vehicle’s control modules. Sometimes, manufacturers release updates to fix known issues

  10. 10. Perform a Network Test

    If available, use a scan tool capable of performing a network test to check the communication between modules. This can help identify which module is causing the issue

  11. 11. Clear the Codes and Test Drive

    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

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U1107 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known fixes

  13. 13. 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 OBD-II systems and the specific vehicle in question. By following these steps, you can systematically diagnose and address the U1107 code. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle