What Does U0252 Mean?
Communication with the rear lighting control module B has been lost. This module manages rear exterior lighting functions such as tail lights, brake lights, or auxiliary lighting.
Common Causes
35%
Corroded or damaged wiring/connectors at rear of vehicle
30%
Failed rear lighting control module B
20%
Water intrusion or moisture damage at module location
10%
Poor ground connection at rear lighting module
5%
Network communication fault or damaged CAN bus wiring
Diagnostic Steps
1
Step 1: Inspect rear lighting module connector and housing for moisture, corrosion, or damage
2
Step 2: Test power and ground at module connector with multimeter
3
Step 3: Check rear wiring harness routing for damage, especially near trunk/tailgate hinge areas
4
Step 4: Use scan tool to monitor network communication and check for module presence
5
Step 5: If all connections are intact, substitute module with known-good unit to verify failure
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
Communication with the rear lighting control module B has been lost. This module manages rear exterior lighting functions such as tail lights, brake lights, or auxiliary lighting.
The most common cause of U0252 (Lost Communication With Lighting Control Module Rear "B") is: Corroded or damaged wiring/connectors at rear of vehicle
Typical repair costs for U0252 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Moderate safety concern. Rear lighting functions may be compromised, reducing visibility to other drivers. Verify brake lights and turn signals are functioning.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0252 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Network Communication / Exterior Lighting System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
