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January 14, 2026 Service bulletin

Complaint For the potentially affected vehicles, excessively high aging of the battery was calculated at...

Mercedes-Benz technical service bulletin LI54.10-P-080199 for 2022-2026 Mercedes-Benz C300, 2025-2026 Mercedes-Benz E350 and 2023-2026 Mercedes-Benz GLC 300 and others.

Bulletin number
LI54.10-P-080199
Component
Electrical system
Summary
Complaint For the potentially affected vehicles, excessively high aging of the battery was calculated at cold battery temperatures ( 125%: Drive for 60 min to add SOH-R value. 2.2 Read out actual value 056 in A66 control unit (age limit SOH-R) a. If SOH-R 125%: Park vehicle > 12 hours in the workshop at a warm ambient temperature > 15°C, then drive for 60 min. 2.3 Read out actual value 056 in A66 control unit (age limit SOH-R) a. If SOH-R 125%: Create TIPS case

Owners of these vehicles have filed 129 complaints in the electrical category.

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