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Service bulletin LI54.21-P-078926

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11021149
Published by NHTSA2025-08-01
Manufacturer's numberLI54.21-P-078926
Manufacturer's date2025-08-01
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Complaint Check engine light comes on when driving/starting the vehicle. No drivability concerns. Cause SW conflict of the 48V battery Remedy Update the 48V battery to SW 25/12 A0019020424

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

Vehicles listed
MERCEDES-BENZ AMG CLA352020 to 2024
MERCEDES-BENZ AMG CLA452020 to 2023
MERCEDES-BENZ AMG GLA 352024 to 2025
MERCEDES-BENZ AMG GLA352021 to 2023
MERCEDES-BENZ AMG GLA452021 to 2023
MERCEDES-BENZ AMG GLB352021 to 2025
MERCEDES-BENZ CLA 2502020 to 2025
MERCEDES-BENZ GLA 2502021 to 2025
MERCEDES-BENZ GLB 2502020 to 2025

Listing a model year does not mean every vehicle of it is concerned: the document says which.