What Does U1139 Mean?
The module cannot receive valid data from another module on the SCP (Standard Corporate Protocol) J1850 communication network. A primary module is not transmitting its identification data correctly or at all.
Common Causes
35%
Faulty or failing instrument cluster module
30%
Damaged or corroded wiring in the SCP bus network
20%
Poor ground connection at primary module
15%
Defective powertrain control module (PCM) communication circuit
Diagnostic Steps
1
Step 1: Verify battery voltage is at least 12V and check for proper ground connections at all network modules
2
Step 2: Inspect SCP network wiring harness for damage, chafing, or corrosion at connectors
3
Step 3: Use scan tool to monitor network communication and identify which Primary ID module is not responding
4
Step 4: Check resistance between SCP bus terminals (should be approximately 100-120 ohms with all modules connected)
5
Step 5: Test suspect module by disconnecting it and checking if other network codes clear; replace module if confirmed faulty
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The module cannot receive valid data from another module on the SCP (Standard Corporate Protocol) J1850 communication network. A primary module is not transmitting its identification data correctly or at all.
The most common cause of U1139 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Faulty or failing instrument cluster module
Typical repair costs for U1139 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience intermittent gauge operation, warning light malfunctions, or loss of certain features. Generally safe to drive but should be diagnosed promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1139 to identify the root cause.
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Quick Info
Category
Network
System
Communication Network
Difficulty
Type
Manufacturer
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