48 V battery G1/3 with P0A7F00 - The age limit of the
hybrid/high-voltage battery module has been reached
Topic number

LI54.10-P-078888

Version

1

Function group

54.10 - Battery, power supply, voltage converter

Date

2/10/25

Validity

Model series 177, 118, 247 with equipment code B01

Reason for change

Distribution adjusted.

Complaint
The engine warning 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
Perform guided test for fault code "P0A7F00".
Important! To ensure a bus idle of 90 minutes is achieved, the vehicle should be locked and the key placed a minimum of 30 feet from the vehicle)
See SI82.85-P-0046A

Attachments
File

Description

si8285p0046a.pdf

WIS-References
Document number

Title

Note

SI82.85-P-0046A

Service Information: Restricting Remote Functions for maintenance and
repair work

Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
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is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.

Symptoms
Overall vehicle > Power supply > Battery/On-board electrical system > Battery/on-board electrical system display
message > Battery/Alternator - Serviced Required
Overall vehicle > Power supply > High-voltage on-board electrical system > High-voltage battery > Display message

Control unit/fault code
Control unit

Fault text

G1/3 - 48-V on-board electrical system battery (48 V LIB) P0A7F00 - The state of health limit of the hybrid/high-vol(LIB48_177PT4)
tage battery module has been reached. _

Operation numbers/damage codes
Op. no.

Operation text

Time

Damage
code

Note

540HY

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