No. 78-25 Service Bulletin/Repair Instructions

Service
Technical Information
78/25
ENU
3734
Calibration of Double Clutch Transmission Not Possible - Comply with Procedure for Calibration

(78/25)
3
Vehicle Type:
911 Carrera (992)

911 Carrera S (992)

911 Carrera 4S (992)
Model Year:
2025
Equipment:
8-speed automatic transmission for rear-wheel drive (M-no. G1F)

or

8-speed automatic transmission for all-wheel drive (M-no. G1G)
Concerns:
Double clutch transmission
Cause:
During a workshop visit, the calibration of the double clutch transmission cannot be completed with the

PIWIS Tester.
Action:
Recalibrate double clutch transmission using the following procedure:

•

•

•
Temporary programming of transmission electronics control unit with special software

Calibrating double clutch transmission

Programming transmission electronics control unit with standard software
Information

The described action is only allowed to be used if a calibration of the double clutch transmission is required

due to a part replacement.

This action must not be used for comfort complaints or for other derivatives such as the 911 GTS from MY

2025.
Information

The minimum programming requirement is the PIWIS Tester software release: 43.600.000 (or higher)
Required tools

Tools:
•

•
P90999 - PIWIS 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

Charge the battery and vehicle electrical system'
AfterSales
Sep 10, 2025

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Technical Information
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Recalibrating double clutch transmission using special software

Work Procedure: 1
Programming transmission electronics control unit with special software.

Information

After programming the special software, it is no longer possible to engage gears D and R.

In addition, a yellow transmission warning message appears on the instrument cluster.

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'

Specific information on control unit programming during this action:

Required PIWIS Tester software release:
43.600.000 (or higher)
Type of control unit programming:
Control unit programming using the 'Campaign'

function in the additional menuof the PIWIS Tester

by entering a programming code.
Programming code:
P9D2K
Programming sequence:
Read and follow the information and instructions of

the PIWIS Tester during the guided programming

sequence.

During the programming sequence, the transmission

electronics control unit is re-programmed and then

automatically re-coded.
Programming duration:
Programming takes up to 15 minutes, depending on

equipment.
Software programmed during this action:
• Transmission electronics control unit

Software part number: 9929273000YY

Software release: Y001
Procedure in the event of error messages

appearing during the programming

sequence:
⇒ Workshop Manual '9X00IN Basic instructions and
Procedure in the event of a cancellation of

the control unit programming:
Repeat control unit programming by restarting

programming.
2
Read out and delete all control unit fault memories.
3
Calibrate double clutch transmission.

3.1
Sep 10, 2025

Page 2 of 4
procedure for control unit programming using the

PIWIS Tester'.
Switch on ignition again if necessary.
AfterSales
Service
Technical Information
4
78/25
ENU
3734
3.2
Select Transmission electronics control unit.
3.3
Select Maintenance / Repairs tab.
3.4
Select menu item Calibration of transmission after part replacement, press •F12“ to

continue.
3.5
Follow the instructions of P90999 - PIWIS Tester 4.
3
Programming transmission electronics control unit to the standard software version.

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'
Specific information on control unit programming during this action:

Required PIWIS Tester software release:
43.600.000 (or higher)
Type of control unit programming:
Control unit programming using the 'A utomatic

programming' function of the control unit:

'Transmission electronics' control unit – 'Coding /

programming' menu – 'A utomatic programming'

function.
Programming sequence:
Read and follow the information and instructions

of the PIWIS Tester during the guided

programming sequence.

During the programming sequence, the control

unit is re-programmed and then automatically

re-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 12 minutes, depending

on equipment.
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 a cancellation of the

control unit programming:
Repeat control unit programming by restarting

programming.
5
Read out and delete all control unit fault memories.
6
Exit the diagnostic application and disconnect P90999 - PIWIS Tester 4 from the vehicle.
AfterSales
Sep 10, 2025

Page 3 of 4
3
Service

3734
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Technical Information
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Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging vehicle electrical system battery'
Labor position and PCSS encryption

Labor position:

APOS
Labor operation
I No.
37302549
Program transmission electronics control unit

PCSS encryption:
Location (FES5)
37340
Double clutch transmission
Damage type (SA4)
1611
does not function
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.
© 2025 Porsche Cars North America, Inc.
Sep 10, 2025

Page 4 of 4
AfterSales

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