# Service bulletin LI54.10\-P\-080288

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: 11028907
- Published by NHTSA: 2026\-02\-19
- Manufacturer's number: LI54.10\-P\-080288
- Manufacturer's date: 2026\-02\-19
- 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 1. Check the SOHc of A66 48V battery. \(For SOHr, see LI54.10\-P\-080199\) 2. Carry out SOHc reset routine: \- Switch on ignition \- Read actual value 209 in XENTRY Diagnostics at G1/3 \(48 V battery\) "State of Health Capacity\-SOHC" Valid for OBD markets \-\- If the value is \> 80%, no restoration process required \-\- If the value is \< 81%, continue with the following steps \- Discharge Powerpack in vehicle \- At SOC \< 25%: Stop discharge and bring vehicle to sleep \- \>1.5h after vehicle sleep: Start engine and charge Powerpack to SOC \>65% \- At SOC \> 65%: Stop operation and bring vehicle to sleep \- \>1.5h after vehicle sleep: Turn ignition on \- Read Diagnostic Service C0C3 \(State of Health Capacity \- SOHC\): if \- Capacity \> 74%: You can clear fault memory. Procedure finished. \- Capacity \< 74%: Repeat step 7 again. If after 2 repetitions value is still too high: Read diagnostic service FEE0 \- FEE7 \(Battery Analysis Protocol Part 1\-8\) and replace 48V Powerpack.Perform capacity restoration procedure: Valid for OBD markets \- SOH \> 82%: Process is complete and clear fault memory \- SOH \< 83%: Repeat the steps once more. If the value is still too low after 5 repetitions: Cancel healing process and provide feedback in TIPS case to the HV/LV team inbox labeled "SOHc cannot be reset"

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028907-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028907-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

P0A7F

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ AMG C43
- 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC
- 2024 MERCEDES\-BENZ AMG C63 S E
- 2024 to 2025 MERCEDES\-BENZ AMG C63 S E 4MATIC\+
- 2026 MERCEDES\-BENZ AMG C63 S E PERFORMANCE 4MATIC\+
- 2024 MERCEDES\-BENZ AMG GLC43
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE
- 2025 MERCEDES\-BENZ AMG GLC63 S E
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ COUPE
- 2023 to 2025 MERCEDES\-BENZ AMG S 63 E 4MATIC\+
- 2022 to 2026 MERCEDES\-BENZ C 300
- 2022 to 2026 MERCEDES\-BENZ C 300 4MATIC
- 2025 to 2026 MERCEDES\-BENZ E 350
- 2024 to 2026 MERCEDES\-BENZ E 350 4MATIC
- 2024 MERCEDES\-BENZ E 450
- 2024 to 2026 MERCEDES\-BENZ E 450 4MATIC
- 2024 to 2026 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN
- 2025 MERCEDES\-BENZ E53 E 4MATIC\+
- 2026 MERCEDES\-BENZ E53 E 4MATIC\+ ALL\-TERRAIN
- 2023 to 2026 MERCEDES\-BENZ GLC 300
- 2023 to 2026 MERCEDES\-BENZ GLC 300 4MATIC
- 2024 to 2026 MERCEDES\-BENZ GLC 300 4MATIC COUPE
- 2024 MERCEDES\-BENZ GLC 300 COUPE
- 2025 to 2026 MERCEDES\-BENZ GLC 350 E 4MATIC
- 2026 MERCEDES\-BENZ GLC43 4MATIC COUPE
- 2021 MERCEDES\-BENZ S 500
- 2023 MERCEDES\-BENZ S 500
- 2022 to 2025 MERCEDES\-BENZ S 500 4MATIC
- 2021 MERCEDES\-BENZ S 580
- 2023 MERCEDES\-BENZ S 580
- 2022 to 2025 MERCEDES\-BENZ S 580 4MATIC
- 2023 MERCEDES\-BENZ S 580 E
- 2023 to 2025 MERCEDES\-BENZ S 580 E 4MATIC
- 2021 MERCEDES\-MAYBACH S 580
- 2022 to 2025 MERCEDES\-MAYBACH S 580 4MATIC
- 2023 to 2024 MERCEDES\-MAYBACH S 680
- 2022 to 2023 MERCEDES\-MAYBACH S 680 4MATIC
- 2025 MERCEDES\-MAYBACH S 680 4MATIC

JSON: [/v1/bulletins/11028907](/v1/bulletins/11028907)

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