What Does U1087 Mean?
Related to U1086, this code indicates continued or duplicate issues with primary identification data on the SCP network. Multiple modules may be affected or one module has persistent identity failure.
Common Causes
35%
Multiple modules requiring reprogramming after electrical system work or battery disconnect
25%
Network gateway or central body control module failure preventing ID propagation
20%
Persistent low voltage condition during module initialization
15%
Damaged network bus preventing proper module enumeration at startup
5%
Failed module memory chip or EEPROM preventing ID storage
Diagnostic Steps
1
Step 1: Perform complete vehicle module scan to identify all modules reporting ID faults
2
Step 2: Check battery state of charge and load test - ensure minimum 12.4V with stable voltage
3
Step 3: Attempt network reset procedure per manufacturer service information
4
Step 4: Use factory programming tool to reinitialize all affected modules
5
Step 5: Monitor module communication during key-on initialization sequence to identify timing of failure
Estimated Repair Cost
$100 - $1,000
Parts + labor, varies by vehicle and location
Related to U1086, this code indicates continued or duplicate issues with primary identification data on the SCP network. Multiple modules may be affected or one module has persistent identity failure.
The most common cause of U1087 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Multiple modules requiring reprogramming after electrical system work or battery disconnect
Typical repair costs for U1087 range from $100 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical systems may not communicate properly, affecting airbags, ABS, or stability control. Should be diagnosed and repaired promptly before normal driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1087 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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