No. 160-23 Service Campaign

Service
Technical Information
160/23 ENU WPN9
9
WPN9 - Re-Programming Central Computer (PCM) Control Unit (Workshop/OTA Campaign)
Change

overview:
Revision
Date
Modification
0
11/03/2023
•
Original publication
1
08/29/2025
•
Update to PCM software
2
09/09/2025
•
Correction of required

PIUS software under

Work Procedure Scope 2
Model Year:
As of 2020 up to 2024
Model Line:
Taycan (Y1A/Y1B/Y1C)
Concerns:
Control unit for central computer (PCM)
Cause:
Optimized software is available for the central computer (PCM) control unit.

An overview of optimizations that will be implemented with the software update can be found in the

enclosure under ⇒ Technical Information 'Overview of optimisations of the software update'
Actions:
•

•
Re-program the central computer (PCM) control unit using the latest PIWIS Tester software release in

each case.

Minimum requirement: Release 43.400.040
Checklist:
For better clarity, a checklist was created as an aid for carrying out the campaign.

This does not replace TI.

The checklist does not have to be attached to the job line in PCSS.

For checklist, see ⇒ Technical Information 'Checklist'
Affected

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

Information

Scope definition

Scope 1: Over-the-Air (OTA) software update via PCM.

•
Please note that as a rule the OTA software updates should be installed by the driver (main user) via the

Porsche Communication Management (PCM), provided that the software package for the campaign

has been downloaded to the vehicle via OTA (Scope 1) and the update is then displayed in the PCM

‘Updates’ menu.
AfterSales
Sep 9, 2025

Page 1 of 8
9
Service
Technical Information
ENU 160/23
WPN9
Scope 2: Re-programming central computer (PCM) control unit via PIWIS Tester.

•
For vehicles on which the preconditions for performing an OTA software update are not met at the time

of publication of the campaign (online software update in MyPorsche deactivated/Privacy Mode), no

OTA update is displayed in the vehicle (PCM). These vehicles are therefore assigned to Scope 2 of this

campaign and must be updated with the current PIWIS Tester test software for the corresponding

control unit.
•

•

•
P90999 - P90999 - PIWIS Tester 4

Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90 A

USB storage medium Type A+C 32 GB (for PCM update), Part No. V04014999WW000
Required tools

Tools:
Re-programming central computer (PCM) control unit - scope 2

Work

Procedure:
Information

Before starting programming, particular attention must be paid to the following:

•
Switch off the charger off and on once; the battery charger display must be off before starting it again,

because the battery charger automatically switches to trickle charge after 5 hours (default setting in

the charger).
•
Set charge voltage to 14.8 volts.
•
Operate in charging mode.
•
Vehicles with a PVTS contract must be activated for Service mode.
•
The PIWIS Tester must not be charged using the cigarette lighter!
1
The basic procedure for control unit programming is described in the Workshop Manual ⇒ Workshop

Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS Tester'.
2
Select Guest account from the central display (PCM) and activate Privacy mode (available in some

countries).

Information

If Privacy mode is not active, programming may be aborted, resulting in a defect in the central computer

(PCM). Central computers that are replaced as part of the workshop campaign are checked by

Porsche AG. If private mode was not set in the central computer before starting programming, the costs

will be re-debited.
3
Re-program main computer (PCM).

Prepare USB stick with the required PIUS software 9Y2909000AF.

For specific information on control unit programming during this campaign, see the table below.
Sep 9, 2025

Page 2 of 8
AfterSales
Service
Technical Information
160/23 ENU WPN9
9
Required PIWIS Tester software release:
43.400.040 (or higher)
Type of control unit programming:
In the control unit selection (‘Overview’ menu)

select the PCM central computer control unit and

select the ‘Service/repairs’ menu.

Select the ‘Install software update’ function and

press •F12“ (‘Next’) to perform the software

update.
Programming code:
X6H2L
Programming sequence:
Read and follow the information and instructions

on the PIWIS Tester during the guided

programming sequence.

Do not interrupt programming and coding.

A backup documentation process for the

re-programmed software releases starts once

programming and coding is complete.
Required software (part number and software

version):
•
Programming time (up to):
25 minutes
Software release to be programmed during this

campaign:
•
Control unit programmed in this campaign:
•
Procedure in the event of error messages

appearing during the programming sequence:
⇒ Workshop Manual '9X00IN Basic instructions
AfterSales
North America (M-No. ER3/ER4):

9Y2909000AF / 3885
3885
Following control unit programming, the software

release can be read out from the relevant control

unit in the ‘Incremented identifications’ menu

using the PIWIS Tester.

Control unit for central computer (PCM)
and procedure for control unit programming using

the PIWIS Tester - section on “Fault finding”'
Sep 9, 2025

Page 3 of 8
9
Service
Technical Information
ENU 160/23
WPN9
Procedure in the event of a termination in the

control unit programming:
Repeat control unit programming by restarting

programming.

Additional instructions for aborted programming
⇒ Technical Information '9X00IN Additional
instructions if programming is aborted'

Integration test procedure:
•

•
4
The integration test shows a green result

independently of the necessary campaign

The WPN9 campaign must still be carried

out
Read out all fault memories, process and delete existing faults if necessary.

Information

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

first be found and corrected. This work cannot be invoiced under the workshop campaign number.
5
Press •F3“ to start the integration test in the control unit selection.

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

overview and their status.

Information

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

repeated. If the deviation persists, contact Technical Support.
6
Set battery charger back to a charge voltage of 14.4 volts.

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