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Technical Service Bulletin Transaction No.: 2078134/3

93 Q4 e-tron - electric drive system warning lamp lights up / event memory entry:

POBBDOO in 008C Release date: Jan 5, 2026

Condition
Model(s) Year(s) VIN Range Vehicle Specific Equipment
- LX0: Cell module A
Q4 e-tron, and Q4 2022 — 2024 All
Sportback e-tron LX6: Cell module G
REVISION HISTORY
Revision | Date Purpose
3 - Revised Service (Measure updated)
2 12/04/2025 | 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 the battery module that must be replaced has a manufacturing date prior to 12/04/2023 and has one
of the following part numbers: 0Z1.915.592.G, 0Z21.915.592.H, 0Z1.915.592.J, 0Z1.915.599.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.

-— Ifabattery module with a manufacturing date from 12/04/2023 onwards is installed, a fechnical 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.

¢« An analysis query is not required for battery modules with a manufacturing date prior to 12/04/2023.

« Only make an analysis query according to TSB 2067544: 93 Cell module label must be documented when
replacing HV modules if the manufacturing date of the battery module that is replaced is 12/04/2023 or later.

O27 6155024 Cn?

* VW AG
Piqorumal (apebedy? uke
News Energy & Stay .

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: * 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 0150 0010 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 |9785 0950 See SRT with
30 reset) associated
operations

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

Check high-voltage battery module 9301 0199 5 TU

(Read manufacturing date)

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

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

further module) associated
operations

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

equalization) associated
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

Claim Comment: As per TSB 2078134/3

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.

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