NHTSA ID Number: 11028584
Manufacturer Communication Number: No. 91-25
TSB/Document Date: 2026-02-06
Summary
Technical information for Various Complaints In Connection With the Hybrid
Drive System (Juddering, Power Loss) and Fault Memory Entries Regarding Separating Clutch
Service
Technical Information
91/25
ENU
2790
Various Complaints In Connection With the Hybrid Drive System (Juddering, Power Loss) and Fault
Memory Entries Regarding Separating Clutch (91/25)
2
Model Line:
Panamera (YAA / YAB)
Model Year:
As of 2024 up to 2026
Equipment:
Hybrid drive system PHEV (M-No. 0K3)
Concerns:
Electric machine with separating clutch
Cause:
The customer complains about a yellow transmission warning message lighting up or has other complaints
about the hybrid drive system, such as juddering or loss of power.
One or more of the following fault memory entries can be stored in the DME control unit fault memory:
•
•
•
•
•
Action:
P288200 - separating clutch, excessive slip
P288300 - Hybrid separating clutch, temperature – above maximum
P288600 - separating clutch, stuck closed
P288400 - separating clutch, stuck open
P2D8D00 - separating clutch, mechanical error
In the event of a customer complaint, re-program the DME control unit using the Porsche Tester.
When programming the DME control unit, the transmission control unit is also re-programmed with a corresponding data record.
Information
The minimum programming requirement is the Porsche Tester software release:43.600.030 (or higher).
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. battery charger 90 A. For further information about the battery
chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689 Charging
vehicle electrical system battery'
Re-programming 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'
Specific information on control unit programming during this action:
AfterSales
Jan 29, 2026
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Service
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ENU
Technical Information
91/25
Required Porsche Tester software releases:
43.600.030 (or higher)
Type of control unit programming:
Control unit programming using the ‘Automatic
programming’ function of the control unit:
Control unit for ‘Motor electronics (DME)’ –
‘Coding / programming’ menu – ‘Automatic
programming’ function.
Programming sequence:
Read and follow the information and instructions
on the PIWIS Tester during the guided
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.
Jan 29, 2026
Page 2 of 4
Programming duration:
Programming takes up to 12 minutes, depending
on equipment.
Software programmed during this action:
See section: ⇒ Technical Information '9X00IN
Overview of programmed data records'
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 termination of control
unit programming:
Repeat control unit programming by restarting
programming.
2
Read out and delete all control unit fault memories.
3
Exit the diagnostic application, switch off the ignition and disconnect P90999 - Porsche Tester 4 from
the vehicle.
4
Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging vehicle electrical system battery'
AfterSales
Service
Technical Information
91/25
ENU
2790
2
Overview of programmed data records
Information
The software part number and software release of the programmed data record are based on the specified
Porsche Tester test software release. Please note that this may change in a later release.
Overview:
Panamera 4 E-Hybrid (YAA / YAB)
Exhaust emission
standard
ULEV
Software part number
– Software release
Model year
2024 (R)
2025 (S)
2026 (T)
–
X
X
DME control unit
976907552BC
0002
Transmission
control unit
0DS909103F
– 0567
Panamera 4S E-Hybrid (YAA / YAB)
Exhaust emission
standard
ULEV
Software part number
– Software release
Model year
2024 (R)
2025 (S)
2026 (T)
–
X
X
DME control unit
976907552BG
– 0002
Transmission
control unit
0DS909108F
– 0567
Panamera Turbo E-Hybrid (YAA / YAB)
Exhaust emission
standard
ULEV
Software part number
– Software release
Model year
2024 (R)
2025 (S)
2026 (T)
-
X
X
DME control unit
976906013AD
– 0002
Transmission
control unit
0DS909111G
– 0567
Panamera Turbo S E-Hybrid (YAA / YAB)
Exhaust emission
standard
ULEV
Software part number
– Software release
Model year
2024 (R)
2025 (S)
2026 (T)
–
X
X
AfterSales
DME control unit
976906013AD
0002
Transmission
control unit
0DS909112G
– 0567
Jan 29, 2026
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Service
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ENU
Technical Information
91/25
Labor position and PCSS encryption
Labor position:
APOS
Labor operation
24702549
Re-program DME control unit
I No.
PCSS encryption:
Location (FES5)
2790V
Electric machine with separating clutch at front
Damage type (SA4)
1612
partly not working
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.
Jan 29, 2026
Page 4 of 4
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TSB/Document ID: No. 91-25
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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