# Service bulletin LI54.10\-P\-078888

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: 11022052
- Published by NHTSA: 2025\-08\-21
- Manufacturer's number: LI54.10\-P\-078888
- Manufacturer's date: 2025\-08\-01
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's 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 \< 80%, continue with the following steps Carry out capacity healing procedures: \- Discharge 48 V battery in vehicle with ignition "On" and check the SOC of the 48 V battery in the workshop menu of the instrument cluster \- At SOC \<30%: Stop discharge and lock vehicle \- with key out of range; \(Bus idle\) \- After 1.5h bus idle: Switch on ignition Read out actual value 209 in XENTRY Diagnosis in the G1/3 \(48 V battery\) "State of Health Capacity\-SOHC" \- SOH \> 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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11022052-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11022052-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

P0A7F

## Vehicles listed

- 2019 to 2022 MERCEDES\-BENZ A 220
- 2020 to 2021 MERCEDES\-BENZ AMG A35
- 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
- 2024 MERCEDES\-BENZ GLA 250 4MATIC
- 2020 to 2025 MERCEDES\-BENZ GLB 250

JSON: [/v1/bulletins/11022052](/v1/bulletins/11022052)

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