2013-2024 Audi High-Voltage Battery Energy Content TSB

Audi has released Technical Service Bulletin (TSB) 2074808/3 to provide dealerships with comprehensive information and procedures for evaluating the energy content of lithium-ion high-voltage batteries in affected vehicles. This TSB, released on December 11, 2025, with its latest revision (Revision 3), is crucial for addressing owner concerns related to battery performance. It applies to 2013-2024 Audi vehicles equipped with an electric drive motor or high-voltage lithium-ion battery, including both fully electric and hybrid models (equipment codes 0K3, 0K9).

The TSB 2074808/3 outlines various test plans to accurately assess battery health, especially when owners report issues such as reduced electrical range or higher fuel consumption. It also clarifies warranty conditions and billing procedures for these diagnostic checks.

Revision History

This Technical Service Bulletin has undergone several revisions to ensure the most current information is available:

• Revision 3 (December 11, 2025): Included revised service instructions with updated verbiage and updated attachment instructions.
• Revision 2 (November 15, 2024): Featured revised service instructions with updated verbiage and a revised warranty section, including an updated warranty table. This revision supersedes previous versions.
• Revision 1 (August 27, 2024): The initial publication of this technical service bulletin.

Symptoms of High-Voltage Battery Concerns

Owners of 2013-2024 Audi electric and hybrid vehicles might notice several indicators that suggest a potential issue with their high-voltage battery's energy content. These customer-reported symptoms include:

• "The electrical range has decreased.": The vehicle travels a shorter distance on a full electric charge than expected or previously experienced.
• "The vehicle's petrol consumption (hybrid) has increased.": Hybrid models may show higher fuel consumption as the system relies more on the internal combustion engine due to reduced electric assistance.
• Desire for reliable battery status information: Some owners may simply require an accurate assessment of their high-voltage battery's status, for example, when considering selling the vehicle, as stated by the customer: "I require reliable information about the status of my vehicle's high-voltage battery so that I can sell the vehicle (for example)."

Dealership workshops have noted that these customer statements can often be reproduced during initial checks. Importantly, the TSB specifies that there are typically no relevant active or static event memory entries (DTCs) logged in the control unit for hybrid battery management (diagnostic address 008C) directly indicating a battery issue, making specialized testing necessary to determine the Audi high-voltage battery energy content.

Important Warnings for Owners

Audi TSB 2074808/3 includes several critical notices that owners should be aware of, especially regarding warranty coverage and billing for diagnostic services:

• Applicability: This TSB exclusively applies to vehicles with an electric drive motor or high-voltage lithium-ion battery, covering both fully electric vehicles and hybrid vehicles. Vehicles without this specific equipment are not covered.
• Warranty Conditions: Owners should be aware of 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 for the diagnostic service.
• Billing for Warranty-Covered Faults: If checking the energy content does reveal 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.
• Customer-Requested Checks: If the energy content is checked at the customer's request (not necessarily due to a warranty-eligible complaint), it is not possible to bill a warranty claim to the manufacturer.
• Battery Capacity Threshold: A battery capacity of 70% or above is considered normal and does not constitute a fault covered under warranty. If the test result shows a battery capacity of 70% or above, the test work ends, as this is not a warranty-eligible fault. No numerical value will be indicated for capacities at or above 70% in the 'Battery Health Status' test plan, only an 'OK' status.
• Below 70% Capacity: If the battery capacity is found to be below 70%, owners should check the specific warranty conditions for their vehicle to determine coverage. Before any high-voltage battery replacement, it is mandatory to contact the importer for further guidance.
• Preconditioning Benefits: Owners can positively influence the accuracy and efficiency of the battery energy content measurement by preconditioning the high-voltage battery. This can lead to a more qualified measurement value (improving tolerance from +/- 10% to +/- 5% percentage points) and potentially reduce the time the vehicle needs to spend in the workshop by avoiding waiting times for battery discharge.

Technical Background

The high-voltage batteries used in Audi's electric and hybrid vehicles are subject to natural aging effects over time. This aging process can lead to a reduction in the battery's energy content, also known as energy density. This reduction is considered a normal characteristic of battery life. The TSB emphasizes that while this phenomenon is expected, it can manifest as the symptoms described by owners, such as a reduced electrical range or increased fuel consumption. The purpose of the diagnostic procedures outlined in TSB 2074808/3 is to accurately quantify this energy content and determine if it falls within acceptable parameters or if it warrants further action under warranty conditions.

Diagnosing High-Voltage Battery Energy Content

To address concerns about the Audi high-voltage battery energy content, technicians utilize specific test plans found within the Guided Fault Finding system. These test plans are designed to accurately determine the remaining energy content of the high-voltage battery. The primary diagnostic path for these tests is typically found under:

• 008C - Hybrid Battery Energy Management
• 008C - Battery management, functions
• 008C - Determining remaining energy content of the high-voltage battery

There are three main test plans available, each with different characteristics regarding duration, output, measurement tolerance, and billing options. These are the Battery Health Status (BHS), Battery Health Certificate (BHC), and Battery Health Quick Test (BHQ).

Test Plans for High-Voltage Battery Energy Content

Feature	Battery Health Status (BHS)	Battery Health Certificate (BHC)	Battery Health Quick Test (BHQ)
Duration	Approx. 25 to 50 TU	Approx. 50 TU of productive tester time. Total duration up to 750 TU	Approx. 25 to 50 TU
Output	General indication, no numerical value in %	Numerical value in %	Numerical value in %
Measurement tolerance	+/- 10 percentage points	+/- 1-2 percentage points	+/- 10 percentage points (without qualified measurement) +/- 5 percentage points (with qualified measurement)
Billing options	Warranty if customer complaint is justified	Warranty if customer complaint is justified. or In customer order	Only in customer order

Repair Procedure Summary: Assessing Battery Health

The overall procedure, guided by TSB 2074808/3, focuses on accurately assessing the Audi high-voltage battery energy content rather than an immediate repair or replacement. The steps vary depending on whether the check is initiated due to a warranty concern or a customer request.

1. Warranty-Covered Checks

For vehicles where the energy content check is performed under warranty conditions, the following test plans must be used in sequence within Guided Fault Finding:

• Initial Test: First, perform the "Battery Health Status" test plan.
  • If the test result shows a battery capacity of 70% or above, this is indicated within the test plan by an "OK." No numerical value is provided in this step. If this condition is met, the test work ends here, as there is no fault covered under warranty.
  • If Guided Fault Finding does not recommend a long measurement (indicated by "no"), the test work also ends here.
• Long Measurement (if recommended): If Guided Fault Finding recommends a long measurement (indicated by a "yes"), the "Battery Health Certificate" test plan must then be performed.
  • The battery capacity is indicated as a percentage value. If this test result shows a battery capacity of 70% or above, the test work ends here. This is not a fault which is covered under warranty.
  • If the test result shows a battery capacity below 70%, technicians must check the warranty conditions applying to the vehicle to determine if it is covered by warranty. Before replacing the high-voltage battery, the importer must be contacted.

2. Customer-Requested Checks

If the energy content determination is requested by the customer (not necessarily due to a warranty-eligible complaint), the following test plans can be used:

• Perform either the "Battery Health Quick Test" or the "Battery Health Certificate" test plan in Guided Fault Finding.
• It is important to note that if the energy content is checked solely at the customer's request, it is not possible to bill a warranty claim to the manufacturer.

Preconditioning the High-Voltage Battery

For both types of checks, preconditioning the high-voltage battery can significantly improve the accuracy of the measurement. Preconditioning can generate a qualified measurement value for all vehicle types, improving the measurement tolerance from +/- 10 percentage points to +/- 5 percentage points. It also reduces the length of time the vehicle needs to remain in the workshop by avoiding waiting times for battery discharge.

Warranty and Billing Information

Warranty claims for diagnosing the Audi high-voltage battery energy content must adhere strictly to Audi's policies. The TSB specifies that only the "Battery Health Status (BHS)" and "Battery Health Certificate (BHC)" tests can be billed under warranty, and only 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.

The TSB states that the service number and damage code are "not applicable" as no separate claim is to be made for the diagnostic work itself; rather, it should be integrated into the claim for any subsequent repair if a warranty-covered fault is found.

For billing purposes, the following repair operation numbers are provided for the test work:

Claim Type	Operation Description	Operation Number	Time Unit (TU) / Notes
BHC Test Plan	Check high-voltage battery assembly	9303 0100	See SRT with associated operations
BHC Test Plan	High-voltage battery assembly diagnosis	9303 0599	50 TU
BHS Test Plan	GFF/Guided Functions	0150 0010	See SRT with associated operations
BHS Test Plan	Check high-voltage battery assembly	9303 0299	Time stated on the diagnostic protocol

Claim Comment: Claims should include the comment "As per TSB 2074808/3."

It is crucial that all warranty claims submitted for payment comply with the Audi Warranty Policies and Procedures Manual, as claims are subject to review or audit by Audi Warranty. If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only, and costs for diagnosis and repair would typically be borne by the owner.

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Source: NHTSA ID 2074808/3