U1192 – SCP (J1850) Invalid or Missing Data for Primary Id

The ODBII code U1192 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 connected modules.

The severity of ODBII code U1192 is typically considered moderate.

Common Causes For: U1191 U1191: “Module Communication Failure”

• Faulty or damaged wiring/connectors
• Malfunctioning or disconnected sensors
• Issues with the vehicle’s communication network
• Faulty PCM (Powertrain Control Module)
• Corrupted or missing data in the vehicle’s software
• Interference from aftermarket devices
• Low battery voltage or poor ground connections

Common misdiagnosis for U1192 SCP (J1850) Invalid or Missing Data for Primary Id

• Faulty PCM (Powertrain Control Module)
• Bad wiring or connectors
• Faulty data bus communication
• Incorrectly configured aftermarket accessories
• Defective sensors
• Battery or power supply issues
• Software glitches or updates needed
• Faulty instrument cluster

Common Troubleshooting Steps

When dealing with OBD-II code U1192, which indicates “SCP (J1850) Invalid or Missing Data for Primary ID,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. This code typically relates to communication problems within the vehicle’s network, particularly with the SCP (Serial Communication Protocol) used in some Ford vehicles. Here are the steps you can take:

• 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 issue.
• Inspect the Wiring and Connectors: **Visual Inspection: Look for damaged, frayed, or corroded wiring and connectors related to the SCP network. Pay special attention to the connectors at the PCM (Powertrain Control Module) and other modules on the network.
• **Secure Connections: Ensure that all connectors are securely plugged in and that there are no loose connections.
• Test the SCP Network: **Network Integrity: Use a multimeter to check the resistance and voltage levels on the SCP network. Ensure that the voltage levels are within the specifications provided by the manufacturer.
• **Signal Quality: If you have access to an oscilloscope, you can check the signal quality on the SCP lines to ensure that data is being transmitted correctly.
• Check for Short Circuits or Open Circuits: Inspect the wiring for any short circuits to ground or power, as well as open circuits that could disrupt communication.
• Inspect Modules on the SCP Network: **Module Functionality: Check the functionality of other modules on the SCP network (e.g., ABS, airbag, etc.). A malfunctioning module can cause communication issues.
• **Reprogram or Replace Modules: If a specific module is identified as faulty, it may need to be reprogrammed or replaced.
• Check the Battery and Ground Connections: Ensure that the vehicle’s battery is in good condition and that all ground connections are clean and secure. Poor power or ground can lead to communication issues.
• 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.
• 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 U1192 code.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing communication issues in your specific vehicle. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1192 code.