WOMS
U code network Medium severity

U1160 SCP (J1850) Invalid or Missing Data for Primary Id

The OBD2 code U1160 SCP (J1850) Invalid or Missing Data for Primary Id indicates that the vehicle's communication network is not receiving valid or expected data from a primary module, which may affect the operation of...

Definition

The OBD2 code U1160 SCP (J1850) Invalid or Missing Data for Primary Id indicates that the vehicle's communication network is not receiving valid or expected data from a primary module, which may affect the operation of various systems

Common causes

  • Faulty or damaged wiring/connectors
  • Malfunctioning or disconnected sensors
  • Issues with the vehicle's communication network
  • Faulty PCM (Powertrain Control Module)
  • Corrupted or outdated software/firmware
  • Interference from aftermarket devices
  • Poor ground connections
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty PCM (Powertrain Control Module)
  • Bad wiring or connectors
  • Defective sensors
  • Communication issues between modules
  • Incorrectly programmed or updated software
  • Battery or power supply issues
  • Grounding problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the J1850 bus. Look for signs of damage, corrosion, or loose connections. Pay special attention to the connectors on the modules that communicate over this bus

  3. 3. Verify Power and Ground

    Ensure that the modules on the J1850 bus have proper power and ground connections. Use a multimeter to check voltage and ground continuity

  4. 4. Check for Module Communication

    Use a scan tool to check if all modules on the J1850 bus are communicating properly. If some modules are not responding, it may indicate a problem with those specific modules or their connections

  5. 5. Inspect the SCP Bus

    Use an oscilloscope or a scan tool with live data capabilities to monitor the SCP bus for proper signal levels and communication patterns. Look for any irregularities in the data transmission

  6. 6. Look for Interference

    Check for any sources of electrical interference that could be affecting the communication on the J1850 bus. This could include aftermarket accessories or modifications

  7. 7. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the modules. Reconnect the battery and see if the code reappears

  8. 8. Update or Reprogram Modules

    If the vehicle has had recent software updates or module replacements, ensure that all modules are updated to the latest software version. Sometimes, reprogramming a module can resolve communication issues

  9. 9. Replace Faulty Modules

    If a specific module is identified as the source of the problem and is not communicating properly, it may need to be replaced

  10. 10. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the U1160 code. 1

  11. 11. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional technician or a dealership with specialized diagnostic equipment. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U1160 code