WOMS
U code network Medium severity

U1017 SCP (J1850) Invalid or Missing Data for Primary Id

The OBD2 code U1017 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 modules that rely on this data

Definition

The OBD2 code U1017 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 modules that rely on this data

Common causes

  • Faulty or damaged wiring/connectors
  • Malfunctioning PCM (Powertrain Control Module)
  • Issues with the SCP (Serial Communication Protocol) network
  • Faulty sensors or modules on the network
  • Poor ground connections
  • Interference from aftermarket devices
  • Corrupted software or firmware in the PCM or modules
  • Low battery voltage or weak battery
  • Open or short circuits in the communication lines

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Wiring issues or short circuits
  • Faulty communication network (CAN bus issues)
  • Incorrectly configured or incompatible aftermarket parts
  • Faulty sensors (e.g., crankshaft or camshaft position sensors)
  • Battery or power supply issues
  • Corroded or loose connectors
  • Software or firmware issues in the vehicle's control modules

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 U1017 issue

  2. 2. Inspect Wiring and Connectors

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

  3. 3. Repair or Replace

    Repair any damaged wires or connectors as necessary

  4. 4. Check Battery and Ground Connections

    Ensure that the vehicle's 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 another control module) is functioning correctly. This may involve checking for proper operation or testing the module with a scan tool

  6. 6. Communication Test

    Use a scan tool to check if the module can communicate with other modules on the SCP bus

  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. Signal Testing

    Use an oscilloscope or a multimeter to test the signal on the SCP bus for proper voltage levels and waveforms

  9. 9. Check for Interference

    Ensure that there are no aftermarket devices or modifications that could be interfering with the SCP communication

  10. 10. Update or Reprogram Modules

    If the modules are not communicating properly, check if there are any available software updates or reprogramming procedures for the affected modules

  11. 11. 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

  12. 12. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its communication protocols. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U1017 code