What Does U1097 Mean?
The module is not receiving expected data messages over the SCP (Standard Corporate Protocol) J1850 communication network from another control module. This indicates a communication breakdown between modules on the vehicle's data bus network.
Common Causes
35%
Failed or failing control module not transmitting required data
30%
Damaged or corroded wiring in the SCP network bus circuit
20%
Poor ground connection affecting network communication
15%
Corroded or loose module connector pins
Diagnostic Steps
1
Step 1: Using scan tool, identify which specific module is reporting the missing data and which module should be sending it
2
Step 2: Check for additional U-codes that may point to a specific failed module on the network
3
Step 3: Inspect the data link connector (DLC) for damage, corrosion, or bent pins on terminals 2 and 10 (J1850 bus circuits)
4
Step 4: Test network bus circuit continuity and resistance between modules (should be approximately 100-120 ohms)
5
Step 5: Check power and ground circuits to all modules involved in the communication failure
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The module is not receiving expected data messages over the SCP (Standard Corporate Protocol) J1850 communication network from another control module. This indicates a communication breakdown between modules on the vehicle's data bus network.
The most common cause of U1097 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Failed or failing control module not transmitting required data
Typical repair costs for U1097 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience reduced functionality in various systems depending on which module is not communicating. May affect cruise control, instrument cluster, or other comfort/convenience features.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1097 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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