Service

Technical Information

2026

ENU

WTB1

2

WTB1 - Re-Programming the DME Control Unit (Workshop Campaign)
Model Line:

Cayenne Turbo E-Hybrid (9YA / 9YB)

Model Year:

As of 2024 up to 2026

Concerns:

DME control unit

Situation:

There is a possibility that, under certain preconditions, yellow warning messages “All-wheel drive
system faulty”, “Transverse lock faulty” and “Porsche Stability Management failed” may be displayed
intermittently on the instrument cluster on the affected vehicles due to a diagnosis of the DME control unit
designed too sensitively.

Action:

Re-program the DME control unit using the Porsche Tester.
Information
The minimum programming requirement is the Porsche Tester software release:44.000.000 (or higher).

Affected
Vehicles:

Only vehicles assigned to the campaign (see also 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 the vehicle electrical system battery'

Re-program DME control unit
Work Procedure: 1

Re-program DME control unit.
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

Mar 23, 2026
Page 1 of 4

2

Service
WTB1

ENU

Technical Information

2026

Specific information on control unit programming during this action:

Required Porsche Tester software release:

44.000.000 (or higher)

Type of control unit programming:

Control unit programming using the ‘Automatic
programming’ function for the DME control unit:
‘DME’ control unit – ‘Coding / programming’
menu – ‘Automatic programming’ function.
Read and follow the information and instructions
on the Porsche Tester during the guided
programming sequence.

Programming sequence:

During the programming sequence, the DME
control unit is re-programmed first, and then the
transmission control unit is re-programmed.
Thereafter, both control units are 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.

Software programmed during this action:

See section: ⇒ Technical Information '9X00IN
Overview of the programmed DME software
releases'
Following control unit programming, the software
release can be read out using the PIWIS Tester in
the menu ⇒ ‘Extended identifications’.

2

Procedure if error messages appear 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 termination in the
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 this Workshop Campaign.

3

Mar 23, 2026
Page 2 of 4

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

WTB1

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 – with the exception of the DME control unit and the transmission
control unit – can be ignored.
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.

Overview of the programmed DME software releases
Information
The software part number and software release of the programmed data record are based on the specified
Porsche Tester software release. Please note that this may be different in a higher version.
Overview:

Exhaust
emission
standard
ULEV70

Model year
2024 (R)

2025 (S)

2026 (T)

–

X

X

AfterSales

Software part number

Software release

9Y0906023M
(unchanged)

0003 (or higher)

Mar 23, 2026
Page 3 of 4

2

Service
WTB1

ENU

Technical Information

2026

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

Re-program DME control unit
Labor time:
Re-program DME control unit
Includes:
Connecting and disconnecting battery charger
Read out and delete fault memory

Labor time: 61 TU

Þ Damage number WTB1 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.

Mar 23, 2026
Page 4 of 4

AfterSales