What Does U1079 Mean?
SCP network fault indicating yet another module on the J1850 bus is not providing valid data. This represents a fourth module with communication issues on the network.
Common Causes
35%
Failed module not transmitting on network bus
30%
Damaged network wiring or poor connections
20%
Power supply issues affecting module operation
10%
Corrosion or water damage in module or connections
5%
Multiple module failures from electrical event (surge, jump-start)
Diagnostic Steps
1
Step 1: Check for recent electrical events (jump-starts, battery service, aftermarket installations)
2
Step 2: Use manufacturer-specific scan tool to identify module Primary ID
3
Step 3: Verify power and ground at affected module using wiring diagram
4
Step 4: Inspect all connectors in the affected module's circuit for damage or corrosion
5
Step 5: Test for proper bus voltage and termination resistance on SCP network
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
SCP network fault indicating yet another module on the J1850 bus is not providing valid data. This represents a fourth module with communication issues on the network.
The most common cause of U1079 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Failed module not transmitting on network bus
Typical repair costs for U1079 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple network faults may indicate widespread electrical system damage. Could affect critical safety systems depending on which modules are compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1079 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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