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