NHTSA ID Number: 11024513
Manufacturer Communication Number: LI54.10-P-079955
TSB/Document Date: 2025-10-28
Summary
Complaint Suspension fault message: “Drive max. 50 mph” Fault code P0A7F53 - The aging limit of the high-voltage battery
module has been reached. Cause Incorrect determination of the aging limit of the 48V battery due to a software error. If fault code P0A7F53 is set, the 48V battery irreversibly ceases to function, resulting in limited operation of the electric roll stabilization (eARS). Remedy Replacement of the 48V battery and flashing the current software for the control unit LIB48_177.
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TSB/Document ID: LI54.10-P-079955
Replacement Service Bulletin Number:
MFR Communication Date: 2025-10-27
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Suspension fault P0A7F53 current and/or stored
due to deactivation of 48V battery - 223, 294
Topic number
LI54.10-P-079955
Version
1
Function group
54.10 - Battery, power supply, voltage converter
Date
10/27/25
Validity
223 294 AMG with eSuspension
Reason for change
Complaint
Suspension fault message: “Drive max. 50 mph”
Fault code P0A7F53 - The aging limit of the high-voltage battery module has been reached.
Cause
Incorrect determination of the aging limit of the 48V battery due to a software error. If fault code P0A7F53 is set, the
48V battery irreversibly ceases to function, resulting in limited operation of the electric roll stabilization (eARS).
Remedy
Replacement of the 48V battery and flashing the current software for the control unit LIB48_177.
WIS-References
Document number
Title
Note
AR54.10-P-0022SA
Remove/install the 48-V on-board
electrical system battery
Model 223 with engine 177, with code
B01 (48V technology) and code ME10
(hybrid vehicle (plug-in, PHEV))
AR54.10-P-0022WTC
Remove/install the 48-V on-board
electrical system battery
Model 254 with code B01 (48V technology), except code ME10 (hybrid
vehicle (plug-in, PHEV))
AR54.10-P-0022EQU
Remove/install the 48-V on-board
electrical system battery
Model 294 with code 465 (Electric Active Roll Stabilization (EARS))
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
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
27.10.2025 17:53
© Copyright Mercedes-Benz AG
CCUSHWA
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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
Chassis/suspension > Suspension/Dampening > Suspension System Function > Indicator lamp is on
Chassis/suspension > Suspension/Dampening > Roll control > Malfunction
Operation numbers/damage codes
Op. no.
Operation text
Time
Damage
code
541221
Remove/install the 48-V on-board
electrical system battery
AW
0540HY9
27.10.2025 17:53
© Copyright Mercedes-Benz AG
CCUSHWA
Note
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