No. WSS6 Service Bulletin/Repair Instructions

Service
Technical Information
2025
ENU
WSS6
9
WSS6 – Re-Programming 12 V Battery Sensor (Workshop Campaign)

Model Line:
911 (992)
Model Year:
As of 2020 up to 2026
Concerns:
Battery sensor control unit
Cause:
Due to a software error of the battery sensor of the 12-volt vehicle electrical system battery, it is possible

that the battery data of the affected vehicles is calculated incorrectly.

Depending on the usage behavior, this can result in the vehicle not starting after being parked for a longer

period.
Action:
•

•
Affected

Vehicles:
Only vehicles assigned to the Campaign (see also PCSS Vehicle Information).
Re-program the battery sensor control unit using the latest Porsche Tester software release.

Minimum requirement: Version 43.800.000
Every vehicle is assigned just one campaign scope.
Required tools

Tool:
•

•
P90999 - P90999 - Porsche Tester 4

Battery charger with a current rating of at least 90 A and a current and voltage-controlled charge map

for lithium starter batteries, e.g. VAS 5908 battery charger 90 A
Re-programming 12V battery sensor (campaign scope 1 - only valid for 911(992))

Work Procedure: 1
The basic procedure for control unit programming is described in the Workshop Manual: ⇒ Workshop

Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS Tester section on "Programming"'.

For specific information on control unit programming during this Campaign, see the table below.
Required PIWIS Tester software release:
43.800.000 (or higher)
Type of control unit programming:
Control unit programming using the ‘Campaign’

function in the additional menu on the PIWIS Tester

by entering a programming code.
Programming code:
B9D9M
AfterSales
Jan 12, 2026

Page 1 of 4
9
Service

WSS6
ENU
Technical Information
2025
Programming sequence:
Read and follow the information and instructions on

the Porsche Tester during the guided programming

sequence.

During the programming sequence, the battery

sensor is re-programmed and then automaticallyrecoded.

Do not interrupt the programming and coding

process.

A backup documentation process for the

re-programmed software releases starts after

programming and coding.
Programming time (approx.):
15 minutes
Software release programmed during this

campaign:

for vehicles equipped with the battery sensor

control unit in the hardware version H01, H02,

H03
•
Battery sensor control unit: 5220 (or higher)
for vehicles equipped with the battery sensor

control unit in the hardware version H09
•
Battery sensor control unit: 0196 (or higher)
for vehicles equipped with the battery sensor

control unit in the hardware version H11
•
Battery sensor control unit: 0220 (or higher)
Following control unit programming, the software

version can be read out of the ⇒ ‘Extended identifications’ menu from the gateway control unit using

the PIWIS Tester or by viewing the ECU information

under the Battery sensor control unit in the Compare

diagnostic data (VAL) tool in PCSS..

The data for software part number and software

version of the programmed data record are based

on the specified PIWIS Tester test software release.

Please note that this may change in a later release.
Jan 12, 2026

Page 2 of 4
AfterSales
Service
Technical Information
2025
ENU
WSS6
9
Procedure if error messages appear during the

programming sequence:
⇒ Workshop Manual '9X00IN Basic instructions and
Procedure in the event of a termination in the

control unit programming:
Repeat control unit programming by restarting

programming.
2
procedure for control unit programming using the

PIWIS Tester - section on “Troubleshooting”'.
Read out and delete all control unit fault memories.

2.1
In the control unit selection (‘Overview menu’) press •F7“ to call up the Additional menu.
2.2
Select the function “Read all fault memories and delete if necessary” and press •F12“ (‘Next’)

to confirm.

Information

If control units are found to have faults that are not caused by control unit programming,

they must first be located and corrected. This work cannot be invoiced under the workshop

campaign number.
3
For vehicles as of model year 2022: Press •F3“ to start the integration test in the control unit

selection.

All affected control units should now be successfully programmed or checked in the control unit

overview and their status.

There must be no composite damage! Optional control unit updates (except for 12V battery sensor)

should be ignored.

Information

If a deviation in the integration test is still indicated despite the programming carried out, this must be

repeated. If the deviation persists, contact Technical Support.
4
Enter the campaign in the warranty and maintenance logbook.
Warranty processing

Scope 1:
Re-programming 12V battery sensor

•
valid for 911 (992)

Labor time:

Re-programming 12V battery sensor

Includes:

Connect and disconnect the battery charger

Connecting and disconnecting PIWIS Tester

Read out and delete the fault memory
Labor time: 35 TU
⇒ Damage number WSS6 066 000 1
AfterSales
Jan 12, 2026

Page 3 of 4
9
Service

WSS6
ENU
Technical Information
2025
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are

written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in

order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and

may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins

are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester

are the ones that must be followed.
© 2026 Porsche Cars North America, Inc.
Jan 12, 2026

Page 4 of 4
AfterSales

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