WOMS
U code network Medium severity

U1013 SCP (J1850) Invalid or Missing Data for Primary Id

The OBD2 code U1013 SCP (J1850) indicates that there is invalid or missing data for the primary identifier in the vehicle's communication network, which may affect the proper functioning of various systems

Definition

The OBD2 code U1013 SCP (J1850) indicates that there is invalid or missing data for the primary identifier in the vehicle's communication network, which may affect the proper functioning of various systems

Common causes

  • Faulty or damaged wiring
  • Poor connections or corroded terminals
  • Malfunctioning control module
  • Incorrectly configured or incompatible aftermarket parts
  • Software issues or bugs in the control module
  • Interference from other electronic devices
  • Low battery voltage or power supply issues
  • Faulty sensors or components in the communication network

Common misdiagnoses

  • Faulty PCM (Powertrain Control Module)
  • Wiring issues or shorts in the communication lines
  • Bad ground connections
  • Faulty or damaged sensors
  • Issues with the vehicle's battery or charging system
  • Corrupted software or firmware in the PCM
  • Problems with the OBDII connector or pins
  • Incorrectly configured aftermarket modifications or devices

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 U1013 issue

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors related to the affected modules for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    Repair any damaged wires or connectors and ensure all connections are secure

  4. 4. Check the Battery and Ground Connections

    Ensure that the battery is fully charged and that all ground connections are clean and secure. Poor ground connections can lead to communication issues

  5. 5. Test the Modules

    Module Functionality: Verify that the primary module (often the PCM or BCM) is functioning correctly. If possible, use a scan tool to check for communication with the module

  6. 6. Module Replacement

    If a specific module is identified as faulty, consider replacing it

  7. 7. Inspect the SCP Bus

    Bus Integrity: Check the integrity of the SCP bus wiring. Look for shorts, opens, or high resistance in the communication lines

  8. 8. Termination Resistors

    Ensure that the termination resistors are present and functioning correctly, as improper termination can lead to communication issues

  9. 9. Check for Interference

    Look for any aftermarket devices or modifications that may interfere with the SCP bus communication. Remove or disconnect these devices to see if the issue resolves

  10. 10. Perform a Network Test

    Use a scan tool capable of performing a network test to check the communication between modules. This can help identify which module is not communicating properly

  11. 11. Update Software/Firmware

    Check if there are any software or firmware updates available for the vehicle's modules. Sometimes, updating the software can resolve communication issues

  12. 12. Clear 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 reappears

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U1013 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues.1

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U1013 code