What Does U1144 Mean?
This code indicates another unique primary module ID is not transmitting on the SCP J1850 network. The specific module varies by vehicle manufacturer and model.
Common Causes
32%
Failed lighting control module or driver information center
28%
Faulty restraint control module (airbag module)
25%
Corroded or damaged module connector pins
15%
Network bus electromagnetic interference or shielding damage
Diagnostic Steps
1
Step 1: Cross-reference the Primary ID in fault code data to determine which specific module is affected
2
Step 2: Perform visual inspection of the affected module for obvious physical damage or water intrusion
3
Step 3: Test module connector pins for proper tension and electrical contact
4
Step 4: Measure network bus voltage while wiggling harnesses to identify intermittent faults
5
Step 5: Replace the non-communicating module after confirming wiring integrity
Estimated Repair Cost
$175 - $850
Parts + labor, varies by vehicle and location
This code indicates another unique primary module ID is not transmitting on the SCP J1850 network. The specific module varies by vehicle manufacturer and model.
The most common cause of U1144 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Failed lighting control module or driver information center
Typical repair costs for U1144 range from $175 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If airbag module is affected, this is critical and airbag systems may be disabled. Otherwise, typically affects comfort or convenience features with minimal safety impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1144 to identify the root cause.
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Quick Info
Category
Network
System
Communication Network
Difficulty
Type
Manufacturer
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