WOMS
U code network Medium severity

U1196 SCP (J1850) Invalid or Missing Data for Door Locks

The OBD2 code U1196 SCP (J1850) indicates that there is invalid or missing data related to the door lock system, which may affect the operation of the door locks in the vehicle

Definition

The OBD2 code U1196 SCP (J1850) indicates that there is invalid or missing data related to the door lock system, which may affect the operation of the door locks in the vehicle

Common causes

  • Faulty door lock actuator
  • Damaged wiring or connectors
  • Malfunctioning body control module (BCM)
  • Poor ground connection
  • Corrupted data communication between modules
  • Low battery voltage
  • Faulty or disconnected door lock switch
  • Intermittent electrical issues

Common misdiagnoses

  • Faulty door lock actuators
  • Malfunctioning body control module (BCM)
  • Wiring issues or shorts in the door lock circuit
  • Faulty keyless entry system
  • Defective door switch
  • Issues with the vehicle's main computer or ECM
  • Problems with the vehicle's communication network (CAN bus)

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Look for any damaged, frayed, or corroded wires and connectors related to the door lock system

  3. 3. Connector Integrity

    Ensure that all connectors are securely attached and free of corrosion

  4. 4. Test the Door Lock Actuators

    Manually test the door lock actuators to ensure they are functioning properly. You can do this by applying direct power to the actuators to see if they respond

  5. 5. Check the Body Control Module (BCM)

    The BCM is often responsible for controlling the door locks. Check for any signs of failure or malfunction

  6. 6. If possible, perform a reset or reprogramming of the BCM

  7. 7. Inspect the SCP (J1850) Communication Network

    Use a scan tool to monitor the communication on the SCP network. Look for any interruptions or failures in communication between modules

  8. 8. Check for proper voltage levels and ground connections on the communication lines

  9. 9. Test the Fuses

    Check the fuses related to the door lock system and the BCM. Replace any blown fuses

  10. 10. Check for Short Circuits or Open Circuits

    Use a multimeter to check for shorts or open circuits in the wiring harness related to the door locks

  11. 11. Look for Software Updates

    Check if there are any software updates available for the BCM or other related modules. Sometimes, manufacturers release updates to fix known issues

  12. 12. Perform a System Reset

    Disconnect the battery for a few minutes to reset the vehicle’s computer systems. Reconnect and see if the code reappears

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of your vehicle. Manufacturers may have issued guidance on common issues related to door locks and communication codes.1

  14. 14. 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 your vehicle’s specific systems.Conclusion By following these troubleshooting steps, you should be able to identify the root cause of the U1196 code and take appropriate action to resolve the issue. Always ensure safety precautions are taken when working on vehicle electrical systems