2021-2026 Audi High-Voltage Battery Energy Content TSB

Audi has released Technical Service Bulletin (TSB) 93 24 34 2074808/2, superseding previous bulletin 24-04 dated August 27, 2024. This updated TSB, issued on November 15, 2024, provides important information for dealerships regarding the assessment of lithium-ion high-voltage batteries in various Audi models from 2021 to 2026. The TSB focuses on how to accurately determine the energy content of these batteries, particularly when customers report performance issues.

This TSB applies specifically to vehicles equipped with an electric drive motor and a high-voltage lithium-ion battery, encompassing both fully electric and hybrid vehicles. The primary goal is to address customer concerns and provide a standardized diagnostic approach for the Audi e-tron high-voltage battery and similar systems.

Symptoms

Owners of affected Audi vehicles may notice one or more of the following conditions related to their high-voltage battery:

• "The electrical range has decreased."
• "The vehicle's petrol consumption (hybrid) has increased."
• A desire for "reliable information about the current status of my vehicle's high-voltage battery so that I can sell the vehicle (for example)."

Technicians are instructed to reproduce these customer statements as part of the workshop findings.

Important Warnings for Owners and Technicians

Audi has included several critical notices within TSB 93 24 34 2074808/2 that owners and technicians should be aware of:

• "This technical service bulletin (TSB) only applies to vehicles with an electric drive motor / high-voltage lithium-ion battery (fully electric vehicles and hybrid vehicles)."
• "In this connection, please also observe the model year-specific warranty conditions for hybrid vehicles."
• "If checking the energy content does not reveal any faults covered by the warranty, it is not possible to bill the manufacturer."
• "If checking the energy content reveals a fault covered by the warranty, this check must be billed in the claim for the repair required to remedy the fault; it must not be billed separately."
• "If the energy content is checked at the customer's request, it is not possible to bill a warranty claim to the manufacturer."
• "If the test result shows a battery capacity below 70%, check the warranty conditions applying to the vehicle to find out whether this is covered by warranty. Before replacing the high-voltage battery, contact your importer."
• "Only the 'Battery Health Status (BHS)' and 'Battery Health Certificate (BHC)' tests can be billed under warranty if there is a justified customer complaint. If the energy content is checked at the customer's request, it is not possible to bill a warranty claim to the manufacturer."
• "If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only."

Diagnosis and Test Plans

Unlike many issues, this concern typically does not involve specific diagnostic trouble codes (DTCs). The TSB notes, "No relevant event memory entries (active/static) indicating an issue with the high-voltage battery are logged in the control unit for hybrid battery management (diagnostic address 008C)." Instead, diagnosis involves specialized test plans within the Guided Fault Finding system.

There are three primary options for determining the energy content of the Audi e-tron high-voltage battery:

• Battery Health Status (BHS): Provides a general indication without a numerical percentage value. Duration is approximately 25 to 50 Technical Units (TU).
• Battery Health Certificate (BHC): Offers a numerical percentage value for battery health. Duration is approximately 50 TU of productive tester time, with a total duration up to 750 TU.
• Battery Health Quick Test (BHQ): Provides a numerical percentage value. Duration is approximately 25 to 50 TU.

These test plans can be found in Guided Fault Finding under the path: 008C - Hybrid Battery Energy Management, 008C - Battery management, functions, and 008C - Detect battery capacity status. For warranty claims, technicians must use the Battery Health Status or Battery Health Certificate test plans.

Measurement Tolerance

Output	Measurement Tolerance (General)	Measurement Tolerance (Qualified)	Measurement Tolerance (Qualified with Preconditioning)
General indication, no numerical value in %	+/- 10 percentage points	N/A	N/A
Numerical value in %	+/- 1-2 percentage points	+/- 5 percentage points	+/- 5 percentage points

Preconditioning the high-voltage battery can improve the measurement tolerance and reduce the time the vehicle needs to remain in the workshop by avoiding waiting times for battery discharge.

Warranty and Billing

Warranty coverage for checking the Audi e-tron high-voltage battery energy content is contingent on a justified customer complaint. If a fault covered by warranty is found, the check must be billed as part of the repair. However, if the energy content check is performed solely at the customer's request without a justified complaint, it cannot be billed as a warranty claim to the manufacturer.

If the test result indicates a battery capacity below 70%, owners should consult their vehicle's specific warranty conditions. Before any high-voltage battery replacement, the importer must be contacted.

Repair Operation Codes

For billing purposes, the following repair operation numbers are used:

• BHC Test Plan - Check high-voltage battery assembly: 9303 0100
• BHC Test Plan - High-voltage battery assembly diagnosis: 9303 0599 (50 TU)
• BHS Test Plan - GFF/Guided Functions: 0150 0010
• BHS Test Plan - Check high-voltage battery assembly: 9303 0299 (Time stated on the diagnostic protocol)

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Next Steps for Owners

If you are experiencing decreased electrical range or increased fuel consumption in your 2021-2026 Audi with a high-voltage battery, contact your authorized Audi dealership. Reference TSB 93 24 34 2074808/2 to ensure they follow the correct diagnostic procedures for assessing your battery's energy content.

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Source: NHTSA ID: 11011296