2021 Mercedes-Benz AMG GT 12V Battery Mount Issue

Mercedes-Benz has issued Technical Service Bulletin (TSB) LI54.10-P-078605, dated November 18, 2024, to address a specific problem encountered during the replacement of the 12V battery in certain AMG GT models. This TSB falls under function group 54.10, which covers battery, power supply, and voltage converter components.

This bulletin is crucial for technicians and owners alike, as it clarifies a potential fitment issue that can arise when replacing the 12V battery, ensuring the correct procedure is followed to avoid complications.

Symptoms

The primary symptom identified in TSB LI54.10-P-078605 is the physical inability to correctly install a new 12V battery. Specifically, the complaint states: "The 12V battery (A0009824113) cannot be mounted with the holder (A2175453100) provided."

This means that when a new 12V battery is obtained for replacement, the accompanying holder is incompatible with the vehicle's design. The TSB also broadly categorizes the symptom under "Overall vehicle > Power supply > Battery/On-board electrical system > Battery function > Damage," indicating a potential for improper installation to cause broader issues if not addressed correctly.

Diagnosis and Trigger Conditions

The root cause of this AMG GT 12V battery mount problem is identified as incorrect documentation within the replacement parts system. The holder, part number A2175453100, which is sometimes supplied with the new 12V battery (A0009824113), is only intended for Mercedes-Benz model series 217 vehicles.

When a technician attempts to install the new 12V battery (A0009824113) in an AMG GT (model series 190 or 222), they will find that the provided holder (A2175453100) does not fit properly. This incompatibility arises from a mismatch between the parts catalog information and the actual vehicle specifications for the AMG GT 12V battery mount.

Repair Procedure Summary

The remedy for the AMG GT 12V battery mount issue is straightforward. Technicians are instructed to reuse the vehicle's original 12V battery holder when installing the new 12V battery (A0009824113).

The holder (A2175453100) that may be incorrectly supplied with the new battery should not be used. Mercedes-Benz provides an attachment, a video file named "Video AMG.mov," which serves as an example for the assembly of the new 12V battery using the old holder. This ensures the battery is securely and correctly mounted in the vehicle.

Required Parts

For this procedure, the following parts are relevant:

• 12V battery: Part number A0009824113. This is the new battery to be installed.
• Incorrect holder: Part number A2175453100. This holder may be included with the new battery but is not compatible with the AMG GT and should not be used.

Technicians must ensure they retain and reuse the vehicle's existing battery holder to properly secure the new A0009824113 12V battery.

Owner Action

If you own a 2021 Mercedes-Benz AMG GT and are planning a 12V battery replacement, or if a service technician encounters difficulties with the AMG GT 12V battery mount during installation, it is important to reference TSB LI54.10-P-078605. This bulletin provides the necessary guidance to ensure the new battery is installed correctly using the original holder, preventing potential fitment issues.

This information is intended for use by trained professionals. Always consult with an authorized Mercedes-Benz service center for diagnosis and repair.

NHTSA ID: 11010672