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May 27, 2025 Service bulletin

The check engine light illuminates or the 48 V message is displayed in the instrument cluster

Mercedes-Benz technical service bulletin LI54.10-P-078888 for 2020-2024 Mercedes-Benz CLA250, 2020-2025 Mercedes-Benz GLA 250 and 2020-2025 Mercedes-Benz GLB 250 and others.

Bulletin number
LI54.10-P-078888
Component
Electrical system
Summary
Complaint The check engine light illuminates or the 48 V message is displayed in the instrument cluster Cause Fault code "P0A7F00" stored in the 48 V battery G1/3 and/or is current. Remedy Perform guided test for fault code "P0A7F00". Important! To ensure a bus idle of 90 minutes is achieved, the vehicle should be locked and the key placed a minimum of 30 feet from the vehicle) See SI82.85-P-0046A

Owners of these vehicles have filed 65 complaints in the electrical category.

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