What Does U024A Mean?
The vehicle's network has lost communication with the interior lighting control module. This module manages dome lights, courtesy lights, and ambient interior lighting functions.
Common Causes
35%
Faulty interior lighting control module
30%
Damaged or corroded wiring/connectors to lighting module
15%
Poor ground connection at lighting control module
12%
CAN bus network fault or short circuit
8%
Blown fuse or loss of power to lighting module
Diagnostic Steps
1
Step 1: Check fuses for interior lighting control module and verify power and ground at module connector
2
Step 2: Inspect module connector and wiring harness for damage, corrosion, or loose connections
3
Step 3: Use scan tool to attempt communication with lighting module and check for network activity
4
Step 4: Test CAN bus voltage levels at module connector (should see ~2.5V on both CAN High and Low when idle)
5
Step 5: If no network issues found, replace interior lighting control module
Estimated Repair Cost
$120 - $600
Parts + labor, varies by vehicle and location
The vehicle's network has lost communication with the interior lighting control module. This module manages dome lights, courtesy lights, and ambient interior lighting functions.
The most common cause of U024A (Lost Communication With Interior Lighting Control Module) is: Faulty interior lighting control module
Typical repair costs for U024A range from $120 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Minimal safety concern. Interior lights may not function properly which could affect nighttime visibility inside vehicle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U024A to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Network Communication / Interior Lighting System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
