ZN Connection offline

Technical Service Bulletin Transaction No.: 2078134/2
mosBboo jooe drive system warning lamp lights up / event memory entry: Release date: Dec 4, 2025
Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
Q4 e-tron, and Q4 Sportback 2022 — 2024 All LX0: Cell module A
e-tron LX6: Cell module G

REVISION HISTORY

Revision |Date Purpose

2 - Revised Condition (Added model table)
Revised Warranty (Updated Labor operations)

1 05/29/2025 | Initial publication

Customer states:

* The electric drive system warning lamp lights up in the dash panel insert.
and/or

* — The following message is shown in the instrument cluster:

-— Drive system: fault. Please contact workshop.”

and/or

* Various warning lamps light up in the dash panel insert.

Workshop findings:
* One or more of the customer statements can be reproduced.

At least one of the following event memory entries is logged (intermittent/static) in battery regulation control unit -
J840- (diagnostic address 008C):

* POBBDOO: Hybrid Battery Pack Voltage Variation Exceeded Limit
— Symptom: 42345
-— Symptom: 42358
— Symptom: 42365
-— Symptom: 42370

-— Symptom: 42126
— Symptom: 42118
-— Symptom: 42136
— Symptom: 42011
-— Symptom: 42017
— Symptom: 42024
-— Symptom: 42030
-— Symptom: 42038

©

This TSB does not apply if a different symptom number than the ones mentioned above is logged on
event memory entry POBBDOO. Use Guided Fault Finding to work through event memory entry POBBDO. In
this case, the costs for the repair cannot be billed using this TSB.

Technical Background

To identify the affected battery modules, different procedures must be performed in Guided Fault Finding depending
on the software version of the battery management system for the high-voltage battery (battery regulation control
unit).

Production Solution
Not applicable.
Service

1. Check the vehicle history.
2. Identify the affected battery module(s).

3. Check the manufacturing date of battery module(s) and replace battery module(s) if necessary.

Ay caution

Transmission position "P" must be selected when working on the vehicle! Working on the vehicle (e.g.
updating software or renewing/replacing control units) may affect the vehicle's functions until the work is
fully completed. For example: the vehicle may not automatically secure itself from rolling after it has been
exited:

-— For this reason, the vehicle must always be parked and transmission position P selected.

- Actively check that transmission position P is selected before and after faults, breaks or work
interruptions.

— Ifa vehicle that can roll is required during the work, it is absolutely essential to ensure that no active
gear is engaged - instead, shift to transmission position N.

Re. 1: Check vehicle history:

Check the vehicle history to determine whether the same battery module was replaced within the last 30 days and
has now been identified again as being defective with the event memory entry: POBBDOO. A terminal 30 reset must
be performed in this case.
To do this, proceed as follows:
* Switch the ignition off.
« Disconnect TW maintenance connector for high-voltage system ("Service disconnect").

Disconnect 12V battery for approx. 30 seconds. Clear event memory when re-energizing the battery.

« Reassess the complaint after re-energizing the battery.

— The measure can be concluded if the event memory entries are not logged again. The vehicle can be
returned to the customer.

— Continue with point Re. 2 if event memory entries are logged again.

Re. 2: Identify affected battery module(s):

©

Please observe the mandatory steps/work when replacing high-voltage battery modules. These
steps/work processes are described in TSB 2077497: 93 Service info: Electrics - high-voltage battery - Q4
e-tron: necessary work steps when replacing high-voltage modules.

Use the vehicle diagnostic tester to determine the current software version of the hybrid battery management
control unit (diagnostic address: 008C):

— For software version 1041, Guided Fault Finding must be used to identify the affected battery modules.

— For software versions below 1041, the test program 008C — Check cell equalization must be used to
identify the affected battery modules.

¢ According to the result of Guided Fault Finding, the affected battery module(s) must be replaced according to
the Workshop Manual/parts catalogue.

©

Please note that the current Offboard Diagnostic Information System Service must be used:

-— Offboard Diagnostic Information System Service: The ODIS service patch version (product version)
23.0.1 and the baseline version (diagnostic data — didb_GFS-v) 2.48.7 or higher must be installed.

©

The test program "008C — Check cell equalization” can be found under the following path:
-— Systems with diagnostic capability

008C - Hybrid Battery Energy Management -J840

008C - Hybrid Battery Energy Management - Technical Product Information

— AX2 -High-voltage battery 1 - Check cell equalization

Re. 3: Check the manufacturing date of the battery module(s) and replace the battery module(s) if
necessary:

©

The high-voltage battery must first be removed/opened to check/read the manufacturing date.

A

Warning — high-voltage system! High voltage can cause fatal injury. The voltage levels in the high-voltage
system constitute a safety hazard. Danger of severe or fatal injuries from electric shock.

— Itis essential that you observe and adhere to the safety information/safety measures in the Workshop
Manual during all work on the high-voltage system.

« Remove and open the high-voltage battery as per the Workshop Manual.

¢« Check the manufacturing date on type plate of the battery module to be renewed (see Figure 1):

— The consecutive production number (see Figure 1, highlighted in green) also includes the manufacturing
date of the battery module. The manufacturing date of the battery module from the example (see image
1, highlighted green): LGP-POL 08.03.21 F6CUC8770 would therefore be 03/08/2021.

— If a battery module with a manufacturing date prior to 12/04/2023 is installed and has one of the
following part numbers: 021.915.592.G, 0Z1.915.592.H, 021.915.592.J, 021.915.599.G, 0Z1.915.599.H,
0Z1.915.599.J, 0Z1.915.599.P, the battery module must be replaced according to the Workshop
Manual/parts catalogue.

-— Ifa battery module with a manufacturing date from 12/04/2023 onwards is installed, a technical repair
query must be created.

©

If a high-voltage battery module with a manufacturing date before 12/04/2023 was delivered from a current
replacement part order, there is no need to create a technical repair query. These high-voltage battery
modules have already been technically examined and can be installed.

©

Please check if there is an individual control system for damaged parts in your market.

— You must observe the instructions/notes regarding the analysis query as per TSB 2067544: 93 Cell
module label must be documented when replacing HV modules.

* = 021 915 592 H CHO?

071 p14 562 C3452

*™ VW AG
ferme! Cape dy! Ste
reer Ss eee ie

Figure 1. Example image of a battery module type plate with production date: 08 03 21 (= 08.03.2021).

©

If the test program identifies the same battery module as being defective again with the event memory
entry POBBDOO within 30 days, a terminal 30 reset must be performed. To do this, proceed as follows:

— Switch the ignition off.
-— Disconnect TW maintenance connector.
-— Disconnect 12V battery for approx. 30 seconds. Clear event memory when re-energizing the battery.

— Reassess the complaint after re-energizing the battery. If DTC entries are entered again, a “technical
repair query” must be created.

Warranty

This TSB does not apply if different symptom numbers than the ones mentioned above are logged in DTC memory

entry POBBDOO. In this case, the costs for the repair cannot be billed using this TSB.

Claim Type:

e — If the vehicle is outside of any warranty, this Technical Service Bulletin is

informational only.

Service Number: 9301

Damage Code: 0040

Labor Operations: GFF / Guided Functions 01500010 |See SRT with
associated
operations

Deactivate and activate high-voltage system 9310 8350 |See SRT with
associated
operations

Loosen and secure battery earth strap (terminal 30 |97850950 |See SRT with

reset) associated
operations

Remove and install high-voltage battery housing 9302 19xx |See SRT with
associated
operations

Check high-voltage battery module 93010199 |5TU

(Read manufacturing date)

Replace high-voltage battery module 9301 5550 + |See SRT with
associated
operations

Replace high-voltage battery module (every further | 9301 5553 |See SRT with

module) associated
operations

Measure high-voltage battery housing (potential 9302 0350 |See SRT with

equalization) associated

Claim Comment:

operations

Clean high-voltage battery housing

9302 29xx

See SRT with
associated
operations

Apply corrosion protection to high-voltage battery

9302 7550

See SRT with
associated
operations

Check high-voltage system

9310 01xx

See SRT with
associated
operations

GFF / Guided Functions

0150 0060

Time stated on the
diagnostic protocol

As per TSB 2078134/2

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 (2078134) 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.

©2025 Audi of America, Inc. All rights reserved. The information contained in this document is based on the latest

information available at the time of printing and is subject to the copyright and other intellectual property rights of

Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time
without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form

or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites, without the prior expressed written permission of the publisher.