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August 1, 2025 Service bulletin

Complaint 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 2020-2025 Mercedes-Benz CLA250, 2021-2025 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 Update the 48V battery to SW 25/12 A0019020424 Then perform the following measures: - Switch on ignition - Read out actual value 209 in XENTRY Diagnosis for G1/3 (48 V battery) "State of Health Capacity-SOHC" -- If the value > 80% doesn't require a healing process -- If the value is 90%: Procedure is finished and fault memory erased - SOH < 90%: Repeat the steps again. If the value is still too low after 5 repetitions: Abort healing process and open a TIPS case.

Owners of these vehicles have filed 63 complaints in the electrical category.

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