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Technical Service Bulletin Transaction No.: 2078806/2
90 Gateway software update: yellow battery warning lamp + POA1F00 Release date: Apr 30, 2026
Condition
Without PR Codes:
FKO
9MO
KAO
A4, A4 allroad, S4, Q5, Q5e 7Y0
quattro, Q5 Sportback, SQ5, 2024 All
and SQ5 Sportback 0019 — Data Bus OBD Interface
with software:
0042
0043
3039
0019 — Data Bus OBD Interface
AS. A5 Cabriolet, AS ith software:
Sportback, $5, $5 Cabriolet, with sottware:
$5 Sportback, RS 5, RS 5 0025
Sportback A6, A6 allroad, S6,
RS 6 Avant, A7, S7, RS 7, A8, 2004 Al 0027
S8, e-tron GT, RS e-tron GT, 0042
Q7, SQ7, Q8, SQ8, RS Q8,
Q8 e-tron, Q8 Sportback e- 0043
tron, SQ8 e-tron, and SQ8 0051
Sportback e-tron
3039
REVISION HISTORY
Revision [one [pupore
2 Revised header (Updated models, PR Codes, and software)
Revised header (Add Model Year, Model(s), etc.)
Revised Condition (Add description of specific change)
07/31/2025 | Initial publication
Customer states:
The customer complains that there is a yellow warning lamp in the instrument cluster (Figure 1) with a message
about a battery management fault (12V system).

\ oh | f

\ | ee f
A |

|| Electricalsystem: |

ra
|, malfunction! Please \

/ contact Service \
Figure 1. Yellow warning lamp.
The warning lamp disappears after switching the ignition off and then on again but may appear again.
Workshop findings:
The following DTC may be logged in data bus diagnostic interface J533 (DA00019):

+ P0A1F00: Battery Energy Control Module Malfunction

Technical Background

Software issue in diagnostic interface control unit (DA0019).

Production Solution

Production change in Q3/2025.

Service

This TSB replaces PSS 2076606: 90 PSS Yellow Battery Warning Lamp + POA1F00.
Software update to SW 0052 for the diagnostic interface control unit (DA0019):
Applies to vehicles with high-voltage components:

Applies to vehicles with high-voltage components:

— To prevent the high-voltage battery from charging during the following software update, the high
voltage charging cable on vehicles with high-voltage components must be unplugged BEFORE the
SVM code is entered.

— Please note that charging the high-voltage battery during a software update can cause damage to the
high-voltage components.

The software for the diagnostic interface must be updated on this vehicle. Please observe the information

and instructions under “Customer information”.

Please update the data bus diagnostic interface J533 (diagnostic address 0019) via SVM. To enter the SVM code,
use “Flash” mode on the ODIS tester.

Use the function “SVM - Authorized Multiple Code Entry”. The new test program for software updates is included
in ODIS software.

The vehicle uses acoustic signals and flashing lights to indicate when user input is required during and
at the end of the test program.
Use the function “SVM — Multiple authorized code inputs” in “Flash” mode.
CAUTION: the following SVM code must be input exactly as written below (incl. commas and without spaces;
copying and pasting is recommended):
ZGDOIP,19A027,19B027
Follow the instructions on the ODIS tester.
After the update has been completed, diagnostic connector and the charger must be unplugged from the vehicle.
Then start the engine/motor and let it run for a few minutes, then lock the vehicle and wait for five minutes.
Once this is completed, finish the diagnostic procedure via ODIS so that the event memory entry created during the
flashing procedure can be deleted.
Warranty
Claim Type: + If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Damage Code: 0039
Labor Operations: Software update 0151 0010 See SRT with
associated operations.
Software update 0151 0060 Labor according to the
diagnostic log
Check vehicle (bus sleep mode) 0689 0199 10 TU
Claim Comment: As per TSB 2078806/2
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.
Please note the information on predecessors and items that are included and excluded in the repair operations, as
well as any associated tasks.
Additional Information
The software must be updated for a control unit in this vehicle, or the software must be updated on several control
units in this vehicle to ensure they function correctly in conjunction with the other control units in the vehicle. Please
inform the customer about the software update in question and ask whether they or other third parties have modified
the software (e.g. tuning or retrofitting involving modifications to the vehicle’s software). Please inform the customer
that this software update may neutralize previous modifications to the vehicle’s software performed either by the
customer or other third parties.
If the customer declines the software update, please inform them that this could lead to issues or restrictions with
the use of the vehicle or individual components.
Make a note regarding this on the order before it is signed by the customer. Include this information in the customer
file.

All part and service references provided in this TSB (20788806) 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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