Service

Technical Information

2026

ENU

WSV1

2

WSV1 – Re-Programming Gateway Control Unit (Battery Sensor) (Workshop Campaign)
Important:

CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be programmed
with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5 volts during this
programming. Failure to maintain this voltage could result in damaged control unit(s). Damage caused by
inadequate voltage during programming is not a warrantable defect. The technician must verify the actual
vehicle voltage in the PIWIS Tester before starting the campaign and also document the actual voltage on the
repair order.

Model Year:

As of 2025 up to 2026

Model Line:

911 (992)

Concerns:

Gateway control unit (battery sensor)

Cause:

An incorrect service life limit was programmed on the affected 12-Volt vehicle electrical system battery.
This can lead to an early switch-off of the comfort consumers and to an unwarranted message "Battery low –
Service necessary" in the instrument cluster.

Action:

Re-program the Gateway control unit (battery sensor) using the Porsche Tester.
Information
The minimum programming requirement is the Porsche Tester software release:43.800.024 (or higher).

Affected
Vehicles:

Only vehicles assigned to the campaign (also see PCSS Vehicle Information).

Required tools
Tools:

•
•

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. For further information about the
battery chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689
Charging vehicle electrical system battery'

Re-program gateway control unit (battery sensor)
Work Procedure: 1

Re-program gateway control unit (battery sensor).
The basic work 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'

AfterSales

Feb 19, 2026
Page 1 of 3

2

Service
WSV1

ENU

Technical Information

2026

Specific information on control unit programming during this action:
Required Porsche Tester software release:

43.800.024 (or higher)

Type of control unit programming:

Control unit programming using the ‘Automatic
programming’ function of the control unit:
"Gateway" control unit – "Coding / Programming"
menu – "Automatic programming" function.

Programming sequence:

Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During the programming sequence, the battery
sensor is re-programmed and then automaticallyre-coded.
Do not interrupt the programming and coding
process.
Backup documentation for the re-programmed
software releases starts after programming.

Programming duration:

Programming takes up to 45 minutes, depending
on equipment.

Software programmed during this action:

• Gateway control unit (battery sensor):
Software release: 1044 (or higher)
Following control unit programming, the software
release currently cannot be read out from the
Tester. The software level can only be verified in
the Post-VAL.

2

Procedure in the event of error messages
appearing during the programming sequence:

⇒ Workshop Manual '9X00IN Basic instructions
and procedure for control unit programming using
the PIWIS Tester'

Procedure in the event of abnormal termination
of control unit programming:

Repeat control unit programming by restarting
programming.

Read out and delete all control unit fault memories.
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

Feb 19, 2026
Page 2 of 3

Press •F3“ to start the integration test in the control unit selection.
If there is an integration deviation for individual control units, these must be programmed before vehicle
handover to the customer.

AfterSales

Service

Technical Information

2026

ENU

WSV1

2

Information
If, despite the programming performed, a deviation is still displayed during the integration test, the test
must be carried out again.
There must be no breaches of integration!
Control units with optional software can be ignored – with the exception of the Gateway control unit.
4

Exit the diagnostic application, switch off the ignition and disconnect P90999 - Porsche Tester 4 from
the vehicle.

5

Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging the vehicle electrical system battery'

6

Enter the campaign in the Warranty and Maintenance logbook.

Warranty processing
Information
The specified labor time was determined specifically for carrying out this campaign and includes all
necessary preliminary work and rework. The labor time can differ from the labor time published in the Labor
Operation List in the PCSS.
Scope 1:

Re-program gateway control unit (battery sensor)
Labor time:
Re-program gateway control unit (battery sensor)
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Read out and delete fault memories

Labor time: 74 TU

Þ Damage code WSV1 066 000 1
⇒

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.

AfterSales

Feb 19, 2026
Page 3 of 3