What Does U1047 Mean?
This is a duplicate of U1046, indicating continued or multiple instances of missing Primary ID data on the network. This suggests either persistent module failure or widespread network communication breakdown.
Safety Warning
Vehicle will likely not start or operate properly. Multiple vehicle systems may be non-functional, creating potential safety hazards. Vehicle should not be driven.
Common Causes
40%
Failed primary control module unable to initialize or communicate
30%
Complete SCP network bus failure affecting all module communication
15%
Multiple modules unprogrammed or requiring configuration after replacement
10%
Catastrophic electrical system failure affecting module power
5%
Security lockout preventing network initialization
Diagnostic Steps
1
Step 1: Determine if U1047 is from same or different module than U1046 to assess scope
2
Step 2: Perform complete network scan to identify all modules present and their communication status
3
Step 3: Check main power and ground circuits to all control modules with multimeter
4
Step 4: Verify security system status and check if vehicle is in theft mode or security lockout
5
Step 5: Attempt module reprogramming or initialization procedures per manufacturer specifications
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
This is a duplicate of U1046, indicating continued or multiple instances of missing Primary ID data on the network. This suggests either persistent module failure or widespread network communication breakdown.
The most common cause of U1047 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Failed primary control module unable to initialize or communicate
Typical repair costs for U1047 range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will likely not start or operate properly. Multiple vehicle systems may be non-functional, creating potential safety hazards. Vehicle should not be driven.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1047 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication / Module Identification
Difficulty
Type
Manufacturer
Recommended Tools
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