2021-2026 Audi High-Voltage Battery Information TSB

Important Warning for Owners

Owners should be aware that the processes and documents described in Audi TSB 2079520/2 will not be implemented and available for use in Audi systems until October 29, 2025. This means that while the information is being prepared, the official procedures are not yet active for service centers.

Overview of Audi High-Voltage Battery TSB 2079520/2

Audi Technical Service Bulletin (TSB) 2079520/2, released on October 24, 2025, provides essential information regarding the handling of damaged high-voltage batteries in Audi Plug-in Hybrid Electric Vehicles (PHEV) and Battery Electric Vehicles (BEV). This Audi high-voltage battery TSB is primarily an informational document designed to equip dealerships with the necessary documentation and structured approach for correctly processing high-voltage batteries that have been classified as abnormal.

Workshop Findings and Complaint Types

The TSB addresses situations where a "High-voltage battery classified as abnormal" condition is identified. The object of complaint is broadly categorized under "power, vehicle electrical system, data transfer -> power supply -> high-voltage battery." Owners might experience a related "error message" originating from control modules or services within the vehicle's electrical system.

Technical Background

The core purpose of this service information is to provide comprehensive documentation to Audi dealerships. This ensures that high-voltage batteries deemed abnormal are processed correctly and through a structured methodology. The TSB also references additional information to consult when necessary. The ultimate goal is to guarantee that these processes are carried out fully, documented sufficiently, and comply with all safety and quality requirements.

Key Documents and Resources

This Audi high-voltage battery TSB acts as a central reference, pointing to several critical documents and resources for technicians. Due to the complexity of the topic, additional documents will be continuously added to this TSB, meaning complete documentation for all models may not always be immediately available.

Attached Documents

Audi TSB 2079520/2 includes the following documents as attachments, providing detailed guidance:

• Basic information on damaged high-voltage batteries: General information and recommendations for processing damaged lithium-ion batteries.
• PPE briefing: This includes ppe_instructions.pdf, which provides recommended briefings for Category III personal protective equipment, detailing an overview of personal protective equipment and its protective functions and requirements.
• PPE table: Referenced by ppe_table.pdf, this document likely contains specific details about required personal protective equipment.
• Workshop procedure plan: This includes workshop_flow_plan_high-voltage_vehicles_v1.21.pdf, which outlines a typical workshop procedure for high-voltage vehicles, along with qualification requirements for technicians.

Example Catalogues for PHEVs/BEVs

The TSB also references several comparison sample catalogues that provide aids for assessing damage to high-voltage batteries across various Audi PHEV and BEV models:

• comparison_sample_catalogue_a5_a6_q5_e-hybrid_q7_q8_tfsie.pdf: Covers Audi A5, A6, Q5 e-hybrid, Q7, and Q8 TFSIe models.
• comparison_sample_catalogue_e-tron_gt.pdf: Specifically for the Audi e-tron GT.
• comparison_sample_catalogue_q4.pdf: Dedicated to the Audi Q4 model.
• comparison_sample_catalogue_q6_a6_e-tron.pdf: Covers Audi Q6 and A6 e-tron models.

Additional Information Sources

Further resources are provided via internal Audi channels:

• Provided via Service TV: A series of updates on high-voltage vehicle (HVE) topics, including:
  • 0815_HVE update: introduction
  • 0816_HVE update: classification
  • 0817_HVE update: moisture
  • 0818_HVE update: thermal event
• Provided in vehicle-specific Workshop Manuals: These manuals contain flushing processes specifically for high-voltage batteries.

PR Numbers / Option Codes

The TSB lists several PR numbers, which are Audi's internal option codes, indicating specific vehicle configurations related to the high-voltage battery system. These include 0K3, 0K9, G1X, and G1Z. These codes help identify the specific battery configurations relevant to the information provided in the TSB.

Warranty Information

It is important for owners to note that this Audi high-voltage battery TSB is purely informational. It is not applicable to any Audi Warranty. All part and service references provided in TSB 2079520 are subject to change and/or removal, and technicians are advised to check with their Parts Department and/or ETKA for the latest information and parts bulletins.

What Owners Should Do

If you own a 2021-2026 Audi PHEV or BEV and suspect an issue with your high-voltage battery, or if you receive an "error message" related to the electrical system, it is advisable to contact your authorized Audi dealership. While the full procedures outlined in TSB 2079520/2 are not yet active in Audi systems until October 29, 2025, your dealership can provide guidance based on current available information and address any immediate concerns regarding your vehicle's high-voltage battery system.

NHTSA Source Citation

NHTSA ID: 11025385