What Does U1102 Mean?
The module is unable to receive primary identification messages from another specific module on the network. This represents a targeted communication loss between two specific control modules.
Common Causes
35%
Specific control module failure preventing network transmission
30%
Damaged wiring or connector specific to the affected module branch
20%
Poor ground connection at specific module location
10%
Water damage or corrosion in module connector
5%
Module not properly configured or programmed after replacement
Diagnostic Steps
1
Step 1: Identify the specific module pair involved in the communication failure using scan tool data
2
Step 2: Verify both modules have proper power and ground using voltage measurements at connectors
3
Step 3: Inspect connectors at both the transmitting and receiving modules for damage or corrosion
4
Step 4: Test network bus resistance and continuity between the two affected modules
5
Step 5: If wiring and power are good, suspect failed module; verify by substitution or known-good swap if possible
Estimated Repair Cost
$150 - $1,300
Parts + labor, varies by vehicle and location
The module is unable to receive primary identification messages from another specific module on the network. This represents a targeted communication loss between two specific control modules.
The most common cause of U1102 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Specific control module failure preventing network transmission
Typical repair costs for U1102 range from $150 to $1,300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Impact varies based on affected modules. Could range from non-functional accessories to critical safety system failures requiring immediate attention.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1102 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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