What Does U1093 Mean?
Similar to U1092, this represents missing or invalid primary identification data from a different module or for a different parameter on the SCP network. Multiple U109X codes suggest widespread communication issues or multiple module failures.
Common Causes
40%
Multiple module communication failure due to bus wiring fault
30%
Failed control module not transmitting primary ID data
15%
Widespread connector corrosion affecting multiple modules
10%
Power distribution problem affecting multiple modules
5%
Bus termination failure causing widespread communication errors
Diagnostic Steps
1
Step 1: Document all communication codes present and identify all affected modules and their physical locations
2
Step 2: Measure SCP bus resistance with all modules connected (should be 100-120 ohms) and compare to specification
3
Step 3: Check battery voltage and charging system operation as low voltage can cause multiple communication faults
4
Step 4: Inspect common ground points and SCP bus splice locations for damage or corrosion
5
Step 5: Systematically disconnect modules to isolate any module that may be shorting or loading down the bus
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
Similar to U1092, this represents missing or invalid primary identification data from a different module or for a different parameter on the SCP network. Multiple U109X codes suggest widespread communication issues or multiple module failures.
The most common cause of U1093 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Multiple module communication failure due to bus wiring fault
Typical repair costs for U1093 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple missing primary IDs may significantly impact vehicle operation and safety systems. Vehicle may enter limp mode or fail to start.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1093 to identify the root cause.
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Quick Info
Category
Network
System
Communication Network
Difficulty
Type
Manufacturer
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