# 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.

- Type: Service bulletin
- NHTSA id: 11021149
- Published by NHTSA: 2025\-08\-01
- Manufacturer's number: LI54.21\-P\-078926
- Manufacturer's date: 2025\-08\-01
- NHTSA component: ELECTRICAL 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021149-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021149-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Vehicles listed

- 2020 to 2024 MERCEDES\-BENZ AMG CLA35
- 2020 to 2023 MERCEDES\-BENZ AMG CLA45
- 2024 to 2025 MERCEDES\-BENZ AMG GLA 35
- 2021 to 2023 MERCEDES\-BENZ AMG GLA35
- 2021 to 2023 MERCEDES\-BENZ AMG GLA45
- 2021 to 2025 MERCEDES\-BENZ AMG GLB35
- 2020 to 2025 MERCEDES\-BENZ CLA 250
- 2021 to 2025 MERCEDES\-BENZ GLA 250
- 2020 to 2025 MERCEDES\-BENZ GLB 250

JSON: [/v1/bulletins/11021149](/v1/bulletins/11021149)

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