2021 Mercedes-Benz AMG GT 12V Battery Holder Issue

Mercedes-Benz has released Technical Service Bulletin (TSB) LI54.10-P-078605, addressing a specific issue encountered when replacing the 12V battery in certain models, including the 2021 Mercedes-Benz AMG GT. This bulletin provides crucial guidance for technicians and owners regarding the proper installation of a new 12V battery. The primary concern is that the new 12V battery (A0009824113) may not fit correctly with the new holder (A2175453100) that might be supplied as a replacement part.

Symptoms of the 2021 Mercedes-Benz AMG GT 12V Battery Holder Issue

While this TSB primarily addresses an installation challenge rather than a direct vehicle malfunction, the underlying symptom described is "Overall vehicle > Power supply > Battery/On-board electrical system > Battery function > Damage." This indicates that improper battery installation or issues related to the battery's mounting could lead to broader electrical system problems or battery damage. An owner might notice difficulties during a battery replacement attempt, specifically that the new 12V battery cannot be mounted with the provided holder.

Understanding the Cause

The root cause of the 2021 Mercedes-Benz AMG GT 12V battery holder issue, as identified by Mercedes-Benz in TSB LI54.10-P-078605, stems from "Incorrect documentation in replacement parts system." This means that the replacement parts catalog might incorrectly suggest a new battery holder (A2175453100) is compatible or required for models like the AMG GT. However, the bulletin explicitly states that this particular holder (A2175453100) "is only intended for model series 217." This discrepancy leads to the situation where the new 12V battery (A0009824113) cannot be properly secured with the incorrectly supplied holder.

The Mercedes-Benz Remedy

To resolve the 2021 Mercedes-Benz AMG GT 12V battery holder issue, the TSB LI54.10-P-078605 provides a straightforward remedy: "Mount new 12V battery on old holder." This means that instead of attempting to use the new, incompatible holder (A2175453100), technicians should reuse the original battery holder from the vehicle. Mercedes-Benz has even provided an attachment, "Video AMG.mov," which serves as an "Example video for assembly of new 12V battery with old holder," to guide service personnel through this process. This ensures that the new 12V battery (A0009824113) is securely installed without fitment problems.

Important Warnings for Owners and Technicians

Mercedes-Benz includes a standard disclaimer in its technical documents, which is particularly relevant for this type of communication. It states: "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 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." This emphasizes that the TSB is for informational purposes for trained professionals and does not automatically imply a defect or warranty coverage.

Affected Parts

The Mercedes-Benz TSB LI54.10-P-078605 specifically references two key part numbers related to the 2021 Mercedes-Benz AMG GT 12V battery holder issue:

• A0009824113: This is the 12V battery itself, which is the component being replaced.
• A2175453100: This is the battery holder that, due to incorrect documentation, might be supplied as a replacement part but is only intended for Mercedes-Benz model series 217 vehicles, not the AMG GT. The bulletin advises against using this holder for the affected models.

Owner Action

If you own a 2021 Mercedes-Benz AMG GT and are planning a 12V battery replacement, or if you have recently had one replaced and suspect an issue with the battery's mounting, it is advisable to consult with an authorized Mercedes-Benz service center. Reference TSB LI54.10-P-078605 to ensure that the correct procedure, specifically reusing the old battery holder, is followed. This will prevent potential fitment problems and ensure the proper function of your vehicle's power supply system.

Source: NHTSA ID: 11010672