No. 65-23 Service Bulletin/Repair Instructions

Service
Technical Information
65/23
ENU
9152
9
Various PCM Central Computer Fault Corrections: Re-Programming PCM Main Computer (65/23)
Change

Overview:
Version
Date
Change
0
07/26/2023
•
First publication
1
01/19/2024
•
Update of PiUS part

numbers
2
05/17/2024
•
Update of Cause
3
04/02/2025
•
PIWIS Tester test software

release adapted

PiUS part numbers adapted

Target software version

adapted

Further complaint added

under "Cause"
•

•

•

4
02/19/2026
•
Update of Action
Model Year:
As of 2022 up to 2023
Model Line:
Cayenne (9YA/ 9YB)
Concerns:
Control unit for central computer (PCM)
Cause:
The PCM cannot be switched on, fails intermittently during vehicle operation or starts up again independently. Possible error patterns:

•

•

•

•
PCM screen remains black

There is no sound output and hands-free device is faulty

Navigation display fails

The PCM can only be started again after some time or starts up again on its own
On vehicles with BOSE® Surround Sound System (M-No. 9VL) or Burmester® 3D High-End Surround Sound

System (M-No. 9VJ), the sound settings in the main menu >> Media >> Bose/Burmester may also be lost

after bus rest:

•

•

•
No longer ticked on the “Heights and depths” settings

No longer ticked on the settings “Balance and fibre”

Setting the bars to “0”
Real Time Traffic display does not show traffic jams in the text in the route monitor.

No access to the vehicle via the MyPorsche app with the message "Vehicle in private mode" although the

vehicle is not in private mode.
AfterSales
Feb 19, 2026

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9
Service

9152
Action:
ENU
Technical Information
65/23
In the event of a complaint, re-code the central computer (PCM) with the latest PIWIS Tester software

version. Check the software version. The VAL supporting the main computer (PCM). software version not

being at the required level would serve as the required documentation for the purposes of warranty claiming,

Information

The minimum programming requirement is the PIWIS Tester software release 43.300.000.
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, already

available at the Porsche Center
Overview of PCM update

Information

The central computer (PCM) software update is performed using a USB storage medium. The software

release that is specific to each region must be downloaded using the software tool PiUS (Porsche integrated

Update Service) and must be installed on a blank USB storage medium.

Pay particular attention to the following:

•
For this PCM software update, a USB storage medium must be used.
•
To use the software tool, one blank or re-writable USB storage medium is required for each individual

software.
•
The software available in PiUS must only be used in accordance with the instructions provided in a

Technical Information published for this purpose.
The software listed here may only be used for the action described here. Damage to the central computer

cannot be ruled out if the software is used on other vehicles.

You will find further information on installation and use for the PiUS software tool in the PPN portal under

*PiUS (Porsche integrated Update Service) goes live*.

Overview:
Feb 19, 2026

Page 2 of 7
Part No.
Designation

– Region
Vehicle allocation
9Y2909000AF
USB storage medium for PCM

update

– North America

– Mexico
I-No. ER3 / ER4
AfterSales
Service
Technical Information
65/23
ENU
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9
Re-programming central computer (PCM) control unit

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).
•
The charger must be set to 14.6 V charging voltage and operated 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!
Information

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

(PCM).
Information

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

found and corrected.

Work Procedure: 1
Unless otherwise already done, prepare USB storage medium with the software required for the PCM

central computer depending on the country variant in accordance with the above overview.
⇒ Technical Information 'Overview of PCM update'

2
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'.
3
Select Guest account from the central display (PCM) and activate Privacy mode (available in some

countries).
4
Re-program main computer (PCM).

For specific information on control unit programming during this campaign, see the table below.
AfterSales
Feb 19, 2026

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Service

9152
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Technical Information
65/23
Required PIWIS Tester software version:
43.300.000 (or higher)
Type of control unit programming:
PCM central computer update using PIWIS Tester

start code to start the guided programming

sequence. The PCM application software is loaded

via USB storage medium.

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:
E3B5S
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 versions starts once

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

version):
•
North America/Mexico (M-No. ER3/ER4):

9Y2909000AF / 3885
Programming time (up to):
25 minutes
Procedure in the event of error messages

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

control unit programming:
Repeat control unit programming by restarting

programming.
and procedure for control unit programming using

the PIWIS Tester - section on “Fault finding”'
Additional instructions for aborted programming

⇒ Technical Information '9X00IN Additional

information if programming is aborted'

Integration test procedure:
Feb 19, 2026

Page 4 of 7
•
The integration test shows a green result

regardless of this update
5
Read out all fault memories, process and delete existing faults if necessary.
6
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.
AfterSales
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Technical Information
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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.

7
End the diagnostic application. Switch off the ignition. Disconnect the Tester from the vehicle.
8
Set battery charger back to a charge voltage of 14.4 volts.
Additional instructions if programming is aborted

Information

If individual programming steps or rework 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

“Troubleshooting”'

In the event of a fault, logging must always be created during programming using •Ctrl“and •L“using the

PIWIS Tester.

Notes:
Control unit:
Situation:
Action:
Cancelling individual control

units:
One or more control units cannot

be programmed or can no longer

be accessed
•
•
•

•

Central computer (PCM)
The central computer freezes

while loading
AfterSales
•

•
Check on whether the

control unit can be accessed

using the PIWIS Tester or if

bus idle does not have to be

carried out

Control unit still not

accessible –> Remove fuse

for control unit –> Ignition on

–> Ignition off –> Re-insert

fuse

Control unit still not

accessible –> Disconnect

battery overnight

Check whether the control

unit is accessible

Starting programming again

Performing PCM factory

reset using the guided PIWIS

Tester procedure
Feb 19, 2026

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Central computer (PCM)
The central computer control

unit cannot be accessed
•
Pulling out fuse for central

computer 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)
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
Labor position and PCSS encryption

Labor position:

APOS
Labor operation
91522520
Programming central computer
Feb 19, 2026

Page 6 of 7
I No.
AfterSales
Service
Technical Information
65/23
ENU
9152
9
PCSS encryption:

Location (FES5)
91520
Central computer
Damage type (SA4)
1614
function not as per specification
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 7 of 7

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