U1147 – SCP (J1850) Invalid or Missing Data for Vehicle Security

The ODBII code U1147 SCP (J1850) indicates that there is invalid or missing data related to the vehicle’s security system, which may affect the operation of security features or systems.

The severity of ODBII code U1147 SCP (J1850) Invalid or Missing Data for Vehicle Security is typically considered moderate to high.

Common Causes For: U1146 U1146: Instrument Cluster Communication Loss

• Faulty vehicle security module
• Poor or damaged wiring/connectors
• Corrupted or missing data in the vehicle’s network
• Malfunctioning OBD-II scanner
• Issues with the vehicle’s power supply
• Software glitches in the vehicle’s control modules
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1147 SCP (J1850) Invalid or Missing Data for Vehicle Security

• Faulty vehicle security module
• Wiring issues or poor connections
• Faulty body control module (BCM)
• Incorrectly programmed or malfunctioning key fob
• Issues with the ignition switch
• Faulty or damaged sensors related to security systems
• Software glitches in the vehicle’s computer systems
• Battery or power supply issues affecting modules

Common Troubleshooting Steps

When dealing with OBD-II code U1147, which indicates “Invalid or Missing Data for Vehicle Security” on the SCP (J1850) communication protocol, there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, related codes can provide more context for the issue.
• Inspect the Vehicle’s Battery and Connections: Ensure the battery is fully charged and in good condition. A weak battery can cause communication issues.
• Check battery terminals and ground connections for corrosion or looseness.
• Examine Wiring and Connectors: Inspect the wiring harness and connectors related to the vehicle security system and the modules involved in the J1850 communication.
• Look for damaged wires, loose connections, or corrosion that could affect communication.
• Check the Security System: Verify that the vehicle’s security system is functioning correctly. This includes checking key fobs, immobilizers, and any related components.
• If the vehicle has a factory alarm or anti-theft system, ensure it is not malfunctioning.
• Test the Modules: Identify the modules that communicate over the J1850 network (e.g., Body Control Module, Instrument Cluster, etc.).
• Use a scan tool to check the status of these modules. Look for any signs of failure or communication issues.
• Perform a Network Test: Use a scan tool capable of performing a network test to check for communication between modules.
• Ensure that all modules on the J1850 network are communicating properly.
• Check for Software Updates: Verify if there are any software updates available for the vehicle’s modules. Sometimes, manufacturers release updates to fix known issues.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the scan tool.
• Take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U1147 code or the vehicle’s security system. Manufacturers may have specific recommendations or known fixes.
• Seek Professional Help: If the issue persists after performing these steps, consider consulting a professional mechanic or dealership. They may have access to specialized diagnostic tools and resources.Conclusion Troubleshooting OBD-II code U1147 involves a systematic approach to check for communication issues, inspect the vehicle’s security system, and ensure all related components are functioning correctly. Following these steps can help identify the root cause of the problem and lead to an effective resolution.