Service

Technical Information

160/23 ENU WPN9

9

WPN9 - Re-Programming Central Computer (PCM) Control Unit (Workshop/OTA
Campaign)
Model Line:

Taycan (Y1A/Y1B/Y1C)

Model Year:

As of 2020 up to 2024

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 42.250.050

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.

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.

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Service

Technical Information

ENU 160/23

WPN9

Required tools
Tools:

•
•
•

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

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 9Y2909000R.
For specific information on control unit programming during this campaign, see the table below.

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Service

Technical Information

160/23 ENU WPN9

9

Required PIWIS Tester software release:

42.250.050 (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:

J1K2T

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.

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

3882

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”'

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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.

7

Enter the campaign in the Warranty and Maintenance logbook.

Warranty processing
Scope 1:

Over-the-Air (OTA) software update via PCM.
•

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No invoicing possible.

AfterSales

Service

Technical Information
Scope 2:

160/23 ENU WPN9

9

Re-programming central computer (PCM) control unit via PIWIS Tester.
•

Vehicles without OTA activation.
Labor time:
Re-programming central computer (PCM) control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester

Labor time: 73 TU

 Damage Number WPN9 066 000 1

Overview of the optimizations of the software update
Overview:

Description

Market relevance /
affected vehicles

The activation of the adjustment of the air conditioning is displayed in the
PCM inverted.

Only for right-hand drive
vehicles

The designations in the climate menu and the settings for the air conditioning in PCM for the footwell “warm” and “cold” are inconsistent.

Only for Swedish market

WiFi pop-ups appear too often in the PCM.

Unrestricted

When transferring a route via the MyPorsche app, the intermediate destinations are only titled as “offroad” in the PCM route overview.

Connect markets

When starting up the PCM, the PCM remains in the loading spinner (rotating
circle).

Unrestricted

The Porsche logo is displayed permanently when the PCM is started.

Unrestricted

Return to the introduction  Technical Information '9X00IN Introduction'

Additional instructions if programming is aborted
Information
If individual programming steps or reworking could not be carried out correctly, see Workshop Manual for
the basic procedure for control unit programming using the PIWIS Tester  Workshop Manual '9X00IN
Basic instructions and procedure for control unit programming using the PIWIS Tester – section on “Fault
finding”'
In the event of a fault, logging must always be created during programming using •Ctrl“ and •L“ using
the PIWIS Tester.
As a general rule, if programming is aborted during programming, programming must be continued.
The entire sequence can be started again at any time using the campaign code. The control unit that has
already been programmed is skipped, or programming is started via the integration test. Starting to use
the integration test is faster.
You can also find further information and instructions specifically for the PCM update, in the table below:

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WPN9

Work
Procedure:

Technical Information

ENU 160/23

Control unit:

Situation:

Action:

Integration test

The integration test shows a
“red” result despite successful
programming

•

Carrying out the integration
test multiple times

Central computer (PCM)

The central computer freezes
while loading

•
•

Restarting J1K2T
Perform PCM factory reset
using the guided PIWIS
Tester procedure

Central computer (PCM)

The central computer control
unit cannot be accessed

•

Pulling out fuse for central
computer control unit –>
Removing fuse for control
unit –> Ignition on –>
Ignition off –> Re-insert fuse

Central computer (PCM)

Programming of the central
computer (PCM) aborts when - >Fault 33 is detected

•

Fault 33 is displayed in the
central computer display
during programming
Start the update in the
Developer menu on the
central computer (PCM).
The update may only be
started from the Developer
menu in this case because
the PCM is already in the
Developer menu
If the update still cannot
be performed –> replace
central computer (PCM)

•

•

Central computer (PCM)

During the tester procedure,
a message appears reporting
that the software is already
up-to-date

•

•

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AfterSales

In the Tester, 2020 is
displayed as the vehicle
type in the top line next to
model year
Re-write vehicle order using
PIWIS Online

Service

Technical Information
Central computer (PCM)

160/23 ENU WPN9
During the tester procedure,
a message appears reporting
that the software is already
up-to-date

•
•

•

•

9

Checking the software
release
If the software release
is lower than 3397,
WMA5/WMA6/AMB5 was
not performed correctly!
Updating PCM to software
3397 as described in TI
WMA5/WMA6/AMB5
Restarting J1K2T

Central computer (PCM)

No start of programming

•

Programming is started
via the additional menu and
not in the central computer
(PCM) control unit under
Service / repairs as
described in the TI

Central computer (PCM)

Programming is not started or
programming is interrupted

•

For other topics that are not
listed in the TI, a PRMs ticket
must be created before
replacing the PCM system

Back to programming  Technical Information '9X00IN Re-programming control unit for central
computer (PCM) - scope 2'

Checklist
Checklist:

Work step:
The checklist is an aid for carrying out the campaign and does not replace the TI information.

Completed:

1. Charger set to 14.8 V and charging mode?
2. Internet connection for PIWIS Tester active?
3. USB stick prepared with the correct PIUS part number?
4. Select Guest account from the central display (PCM) and activate Privacy mode?
5. Central computer control unit programmed?
Read the warnings displayed on the Tester!
6. Fault memory deleted?
7. Integration test error-free?
8. Is the battery charger set to a charge voltage of 14.4 V?
9. Campaign entered in the Warranty and Maintenance logbook?
Return to the introduction  Technical Information '9X00IN Introduction'

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WPN9

Technical Information

ENU 160/23

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.

© 2023 Porsche Cars North America, Inc.

Nov 3, 2023
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