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March 28, 2025 Service bulletin

MBUX head unit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or...

Mercedes-Benz technical service bulletin LI54.71-P-078802 for 2016-2025 Mercedes-Benz GLC 300, 2021-2025 Mercedes-Benz GLA 250 and 2020-2024 Mercedes-Benz GLS 450 and others.

Bulletin number
LI54.71-P-078802
Component
Electrical system
Summary
Complaint MBUX head unit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or (549+U19). Cause Head unit software variant. Remedy For all chassis use Xentry to update head unit (A26/17). Target boot software number should be either: • 247 904 6600 (E905.4) OR • 247 904 7500 (E906.1) If vehicle fits all criteria and either target software is not available via Xentry, please open an XSS ticket.

Owners of these vehicles have filed 378 complaints in the electrical category.

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