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Technical Service Bulletin

93 Service info: lithium-ion high-voltage batteries - determining energy content,

additional information for dealerships

Transaction No.: 2074808/3

Release date: Dec 11, 2025

Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
0K3
All Audi vehicles 2013 - 2024 All OK9
Lithium-ion high-voltage battery
REVISION HISTORY
Revision | Date Purpose
3 - Revised Service (Updated verbiage)
Revised Attachment (Updated instructions)
2 11/15/2024 | Revised Service (Updated verbiage)
Revised Warranty(Updated Warranty Table)
1 08/27/2024 | Initial publication

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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).

Customer states:

* The electrical range

* — The vehicle’s petrol consumption (hybrid) has increased.

or

has decreased.

* — | require reliable information about the status of my vehicle’s high-voltage battery so that | can sell the vehicle

(for example).

Workshop findings:

* The customer statement can be reproduced.

* Norelevant 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).
Technical Background

The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy
content (energy density) being reduced. This reduction in the energy content, which is due to factors such as

ageing, is normal.

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In this connection, please also observe the model year-specific warranty conditions for hybrid vehicles.

Production Solution

Not applicable.

Service

Check energy content of high-voltage battery:

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There are various options in Guided Functions for determining the energy content.

The main differences in the test plans are explained in the following table:

numerical value in %

Battery Health Status Battery Health Certificate | Battery Health Quick Test
(BHS) (BHC) (BHQ)
Duration Approx. 25 to 50 TU Approx. 50 TU of Approx. 25 to 50 TU
productive tester time.
Total duration up to 750 TU
Output General indication, no 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)

Please refer to the note
under “Regarding 2.:”

Billing options

Warranty if customer
complaint is justified

Warranty if customer
complaint is justified.

or

In customer order

Only in customer order

The test plans can be found in Guided Fault Finding under the following path:
— 008C - Hybrid Battery Energy Management

— 008C - Battery management, functions

-— 008C - Determining remaining energy content of the high-voltage battery

1. The following test plans must be used to check the energy content of the high-voltage battery under warranty:
* Battery Health Status
* Battery Health Certificate

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If checking the energy content does not reveal any faults covered by the warranty, it is not possible to bill
the manufacturer.

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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.

2. The following test plans can be used to determine the energy content of the high-voltage battery if requested by
the customer.

* Battery Health Quick Test
* Battery Health Certificate

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If the energy content is checked at the customer’s request, it is not possible to bill a warranty claim to the
manufacturer.

Regarding 1:
* First perform "Battery Health Status” test plan in Guided Fault Finding.

* — 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 indicated.

* — If Guided Fault Finding does not recommend a long measurement (indicated by no), the test work ends here.
* — If the energy content of the high-voltage battery is 70% or above, there is no fault covered under warranty.

* — If Guided Fault Finding recommends a long measurement (indicated by a yes), the “Battery Health Certificate”
test plan must be performed in Guided Fault Finding.

* The battery capacity is indicated as a percentage value. If the 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%, 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.
Regarding 2:

* Perform the “Battery Health Quick Test” or “Battery Health Certificate” test plan in Guided Fault Finding.

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The customer can positively influence the test result in the measurement tolerance by preconditioning
the high-voltage battery. Preconditioning the high-voltage battery can generate a qualified measurement
value for all vehicle types. The qualified measurement value can improve the measurement tolerance
from +/- 10 percentage points to +/- 5 percentage points. In addition to this, preconditioning reduces the
length of time the vehicle needs to remain in the workshop if the long measurement (BHC) is performed
by avoiding waiting times due to discharging the battery to reach the starting conditions. Refer to the
information in the attachments included with this TSB. You can supply the customer with the information
regarding the test plan in question.

Warranty

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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.

Service number/damage code: not applicable as no separate claim is to be made (refer to information above)

The following repair operation numbers can be used to bill the test work:

Claim Type: * — If the vehicle is outside of any warranty, this Technical Service Bulletin is informational

only.

BHC Test Plan | Check high-voltage battery assembly 9303 0100 See SRT
with
associated
operations

High-voltage battery assembly diagnosis 9303 0599 50 TU

BHS Test Plan | GFF/Guided Functions 0150 0010 See SRT
with
associated
operations

Check high-voltage battery assembly 9303 0299 Time stated
on the
diagnostic
protocol

Claim As per TSB 2074808/3

Comment:

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

Additional Information
All part and service references provided in this TSB (2074808) are subject to change and/or removal. Always check
with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

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