U0252 – BMW DTC

BMW DTC U0252 – Lost Communication With Lighting Control Module (Rear ‘B’)

DTC U0252 meaning on BMW

The Diagnostic Trouble Code (DTC) U0252 on a BMW indicates a communication error with the Lighting Control Module (LCM) located at the rear ‘B’ of the vehicle. This error suggests that the control module is not responding or sending data properly, leading to a loss of communication between the LCM and other vehicle systems.

BMW DTC U0252 symptoms

Symptoms of the DTC U0252 on a BMW may include:

• Malfunctioning rear lights
• Erratic behavior of lighting functions
• Dashboard warning lights related to lighting systems
• Loss of control over rear lighting features

BMW DTC U0252 causes

Common causes of the DTC U0252 on a BMW include:

• Faulty wiring or connectors leading to the rear ‘B’ lighting control module
• Defective lighting control module at the rear ‘B’
• Interference from other electronic components affecting communication

BMW DTC U0252 seriousness

The DTC U0252 is considered a moderate issue on a BMW. While it may not directly affect the drivability of the vehicle, it can compromise the safety and functionality of the lighting systems, especially at the rear of the vehicle. It is recommended to address this issue promptly to ensure proper operation of the lighting controls.

How to diagnose DTC U0252 on BMW

To diagnose the DTC U0252 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the specific fault codes.
2. Inspect the wiring and connectors leading to the rear ‘B’ lighting control module for any damage or corrosion.
3. Check the functionality of the lighting control module at the rear ‘B’ using diagnostic tools.
4. Perform a communication test to verify the connection between the LCM and other vehicle systems.

How to fix DTC U0252 on BMW

To fix the DTC U0252 on a BMW, consider the following steps:

1. Repair or replace any damaged wiring or connectors leading to the rear ‘B’ lighting control module.
2. Replace the faulty lighting control module at the rear ‘B’ if necessary.
3. Clear the fault codes using a diagnostic scanner after making the necessary repairs.
4. Test the lighting systems to ensure proper functionality and communication.

How to erase DTC U0252 on BMW

To erase the DTC U0252 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port.
2. Select the option to clear fault codes from the scanner menu.
3. Confirm the action to erase the DTC U0252 from the vehicle’s memory.
4. Turn off the ignition and restart the vehicle to ensure the fault code has been successfully cleared.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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