What Does U1142 Mean?
Another primary module on the SCP network is not transmitting valid identification data. This specific ID differs from U1139 and indicates a different primary module communication failure.
Common Causes
35%
Faulty anti-lock brake system (ABS) module
30%
Transmission control module (TCM) communication failure
20%
Damaged network wiring between modules
15%
Module power or ground circuit fault
Diagnostic Steps
1
Step 1: Use scan tool to identify which specific module address is missing from network communication
2
Step 2: Check module-specific fuses and power supply circuits with a test light or multimeter
3
Step 3: Verify ground connections at the identified module are clean and tight
4
Step 4: Inspect the suspect module's connector for water damage, corrosion, or bent pins
5
Step 5: Substitute known-good module if available to confirm diagnosis before replacement
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
Another primary module on the SCP network is not transmitting valid identification data. This specific ID differs from U1139 and indicates a different primary module communication failure.
The most common cause of U1142 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Faulty anti-lock brake system (ABS) module
Typical repair costs for U1142 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Depending on which module is affected, could impact ABS function, transmission operation, or other safety systems. Verify all critical systems before extended driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1142 to identify the root cause.
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Quick Info
Category
Network
System
Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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