2021-2026 Audi High-Voltage Battery Damage TSB 2079520/2

Audi has issued Technical Service Bulletin (TSB) 2079520/2, a foundational document designed to guide dealerships in the proper handling and processing of vehicles equipped with damaged high-voltage batteries. This TSB, released on October 24, 2025, aims to standardize procedures for ensuring safety and quality when dealing with these critical components.

The bulletin addresses concerns related to the power and vehicle electrical systems, data transfer, and the overall power supply to the high-voltage battery. It is particularly relevant for Audi's Plug-in Hybrid Electric Vehicles (PHEV) and Battery Electric Vehicles (BEV) from model years 2021 through 2026.

Symptoms of Damaged High-Voltage Batteries

Owners might notice various indicators suggesting Audi high-voltage battery damage. These can include error messages displayed by control modules or service systems, specifically pointing to issues within the power system, vehicle electrical system, or data transfer related to the high-voltage battery.

The core condition addressed by this TSB is when a high-voltage battery has been classified as abnormal. This classification triggers the need for specialized processing and adherence to the guidelines outlined in the bulletin and its accompanying documents.

Understanding TSB 2079520/2

TSB 2079520/2 serves as a crucial informational resource for Audi dealerships. Its primary purpose is to ensure that technicians follow a structured and correct approach when processing high-voltage batteries that have been identified as damaged or abnormal. This structured approach is vital for maintaining safety standards and quality requirements during service operations.

Due to the inherent complexity of high-voltage battery systems, Audi anticipates continuously adding more documents to this TSB. This ongoing development means that comprehensive documentation for all affected models may not always be immediately available, but will be updated over time.

Key Resources for Technicians

This TSB references and includes several critical attachments and additional information sources for technicians. These resources provide detailed guidance on various aspects of high-voltage battery handling and repair:

• Basic Information on Damaged High-Voltage Batteries: This includes basic_information_on_processing_damaged_lithium-ion_batteries.pdf, offering general information and recommendations.
• PPE Briefing: Documents like ppe_instructions.pdf provide recommended briefings for Category III personal protective equipment.
• PPE Table: The ppe_table.pdf outlines specific personal protective equipment requirements.
• Workshop Procedure Plan: The workshop_flow_plan_high-voltage_vehicles_v1.21.pdf details typical workshop procedures for high-voltage vehicles and associated qualification requirements.
• Example Catalogues for PHEVs/BEVs: Several comparison sample catalogues, such as comparison_sample_catalogue_e-tron_gt.pdf and comparison_sample_catalogue_q4.pdf, provide aids for assessing damage.
• Service TV Updates: Additional information is provided via Service TV updates, including 0815_HVE (introduction), 0816_HVE (classification), 0817_HVE (moisture), and 0818_HVE (thermal event).
• Vehicle-Specific Workshop Manuals: These manuals contain flushing processes specific to high-voltage batteries.

Important Implementation Note

It is crucial for both technicians and owners to be aware that the processes and documents detailed within TSB 2079520/2 will not be fully implemented and available for use in Audi systems until October 29, 2025. This indicates that while the information is being prepared, the official procedures will become active at a future date.

Owner Action

If you own a 2021-2026 Audi PHEV or BEV and suspect Audi high-voltage battery damage, or if your vehicle displays error messages related to the high-voltage system, it is important to contact your authorized Audi dealership. While this TSB provides internal guidance for future procedures, your dealer can assess the current status of your vehicle and advise on any necessary steps.

Be aware that the full implementation of the procedures detailed in TSB 2079520/2 is scheduled for October 29, 2025. This TSB is strictly informational and does not apply to any Audi warranty. Any repairs or services related to high-voltage battery damage will be subject to your vehicle's existing warranty terms or out-of-pocket costs, depending on the specific circumstances and diagnosis.