BMW DTC U0484 – Invalid Data Received From Lighting Control Module – Rear ‘A’
DTC U0484 meaning on BMW
The Diagnostic Trouble Code (DTC) U0484 for BMW indicates that the Engine Control Module (ECM) has detected invalid data being received from the Lighting Control Module – Rear ‘A’. This means that there is a communication issue between the ECM and the rear lighting control module, leading to incorrect or missing data being transmitted.
BMW DTC U0484 symptoms
Symptoms of DTC U0484 on a BMW may include:
- Malfunctioning rear lights
- Erratic behavior of rear lighting functions
- Dashboard warning light related to lighting system
BMW DTC U0484 causes
Possible causes of DTC U0484 on a BMW include:
- Faulty rear lighting control module
- Wiring or connection issues between ECM and rear lighting control module
- ECM software or hardware problems
BMW DTC U0484 seriousness
While DTC U0484 may not directly affect the drivability of the vehicle, it is important to address this issue promptly as it can impact the proper functioning of the rear lighting system. Driving with malfunctioning lights can compromise safety, visibility, and compliance with road regulations.
How to diagnose DTC U0484 on BMW
To diagnose DTC U0484 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes and confirm U0484.
- Inspect the rear lighting control module for any visible damage or signs of malfunction.
- Check the wiring and connections between the ECM and the rear lighting control module for any issues.
- Perform a communication test between the ECM and the rear lighting control module to identify any data transmission problems.
How to fix DTC U0484 on BMW
To fix DTC U0484 on a BMW, you can try the following solutions:
- Replace the faulty rear lighting control module with a new one.
- Repair or replace any damaged wiring or connectors between the ECM and the rear lighting control module.
- Update the ECM software to the latest version to address any software-related issues.
How to erase DTC U0484 on BMW
To erase DTC U0484 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM memory. After addressing the root cause of the issue and fixing the problem, you can reset the fault codes to ensure that the warning light does not reappear.
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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