What Does U1147 Mean?
Similar to U1146, this code indicates invalid or missing security data on the J1850 SCP network bus. It may represent a different security message ID or secondary security communication failure.
Common Causes
35%
Failed or corrupted anti-theft/security module (PATS, PAM, or theft deterrent module)
30%
Damaged or corroded SCP bus wiring/connectors between security module and network
20%
Faulty instrument cluster or PCM not responding to security queries
10%
Poor ground connection at security module or related control modules
5%
Key transponder recognition failure or damaged key
Diagnostic Steps
1
Step 1: Use scan tool to compare U1146 and U1147 data parameters to identify which security message is failing
2
Step 2: Verify all security-related modules (PCM, BCM, cluster) are communicating on the SCP bus using scan tool network view
3
Step 3: Test continuity and resistance of SCP bus positive and negative circuits between all modules (<5 ohms)
4
Step 4: Check for security system reprogramming TSBs or flash updates from manufacturer
5
Step 5: Perform security system relearn procedure; if unsuccessful, replace security module and reprogram
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
Similar to U1146, this code indicates invalid or missing security data on the J1850 SCP network bus. It may represent a different security message ID or secondary security communication failure.
The most common cause of U1147 (SCP (J1850) Invalid or Missing Data for Vehicle Security) is: Failed or corrupted anti-theft/security module (PATS, PAM, or theft deterrent module)
Typical repair costs for U1147 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or may stall unexpectedly. Anti-theft features may be compromised, reducing security protection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1147 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Security/Anti-theft Network Communication
Difficulty
Type
Manufacturer
Recommended Tools
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