NHTSA ID Number: 11032389
Manufacturer Communication Number: No. 08-26
TSB/Document Date: 2026-05-07
Summary
Technical information for a Malfunction Indicator Light, Battery Voltage Fault on Catalytic Converter Heating Measure “P0D8500” in the DME Control Unit
Service
Technical Information
08/26 ENU
2470
2
Malfunction Indicator Light, Battery Voltage Fault on Catalytic Converter Heating Measure “P0D8500”
in the DME Control Unit (08/26)
Vehicle Type:
911 T (992)
911 GTS (992)
911 4 GTS (992)
911 Dakar (992)
911 Turbo (992)
911 Turbo S (992)
Model Year:
As of 2020 up to 2025
Country /
market:
USA (C02)
Puerto Rico (C02 / C0A)
Canada (C36)
Emissions
Concept:
7CE - LEV3 / Tier3 70
7CR - C6b with RDE
7CM - C6b without RDE
Concerns:
DME control unit
Information:
The customer complains about the yellow malfunction indicator light (MIL) lighting up on the instrument
cluster.
The following fault memory entry is stored in the fault memory of the DME control unit:
•
Action:
P0D8500 - Battery voltage, too high for catalytic converter heating measure (00AB1A)
In the event of a customer complaint, re-program the DME control unit using the Porsche Tester.
Information
The minimum programming requirement is the Porsche Tester software release:44.000.020 (or higher).
Information
Component replacement will not work in the case of this fault pattern.
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 vehicle electrical system battery'
AfterSales
Apr 16, 2026
Page 1 of 5
2
Service
2470
ENU
Technical Information
08/26
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:
Required Porsche Tester software release:
44.000.020 (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.
Programming sequence:
Read and follow the information and instructions
on the Porsche 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.
Programming duration:
Programming takes up to 12 minutes, depending
on equipment.
Software programmed during this action:
See section: ⇒ Technical Information '9X00IN
Overview of programmed DME data records'
Following control unit programming, the software
release can be read out from the respective control
unit using the Porsche Tester in the menu ⇒
‘Extended identifications’.
Apr 16, 2026
Page 2 of 5
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.
AfterSales
Service
Technical Information
08/26 ENU
2470
2
2
Read out and delete all control unit fault memories.
3
Only for vehicles as of model year 2022: 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.
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'
Overview of programmed DME data records
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 release.
Overview:
911 T (992):
•
with manual transmission
Exhaust emission
standard
Model year
ULEV70
2023 - 2024
Porsche part number
(software)
992906021DC
Software release
0001 (or higher)
911 GTS (992):
•
with Porsche Doppelkupplung (PDK)
Exhaust emission
standard
Model year
ULEV70
2022 - 2024
Porsche part number
(software)
992906022BB
AfterSales
Software release
0001 (or higher)
Apr 16, 2026
Page 3 of 5
2
Service
2470
ENU
Technical Information
08/26
911 GTS (992):
•
with manual transmission
Exhaust emission
standard
Model year
ULEV70
2022 - 2024
Porsche part number
(software)
992906022BC
Software release
0001 (or higher)
911 Dakar (992):
•
with Porsche Doppelkupplung (PDK)
Exhaust emission
standard
Model year
ULEV70
2023 - 2024
992906023Q
0001 (or higher)
2024
992906023R
0001 (or higher)
C6b
Porsche part number
(software)
Software release
911 Sport Classic (992):
•
with manual transmission
Exhaust emission
standard
ULEV70
Porsche part number
(software)
Model year
2023
992906025G
Software release
0001 (or higher)
911 Turbo (992):
•
with Porsche Doppelkupplung (PDK)
Exhaust emission
standard
Model year
ULEV70
2021 - 2025
Porsche part number
(software)
992906027AM
Software release
0001 (or higher)
911 Turbo S (992):
•
Apr 16, 2026
Page 4 of 5
with Porsche Doppelkupplung (PDK)
Porsche part number
(software)
Exhaust emission
standard
Model year
ULEV70
2021 - 2025
992906026BC
0001 (or higher)
C6b
2021 - 2025
992906026BD
0001 (or higher)
AfterSales
Software release
Service
Technical Information
08/26 ENU
2470
2
Labor position and PCSS encryption
Labor position:
APOS
Labor operation
I No.
24702543
Programming DME control unit
24702544
Programming DME control unit (with integration
test)
PCSS encryption:
Location (FES5)
24700
DME control unit
Damage type (SA4)
1134
Programming error
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
Apr 16, 2026
Page 5 of 5
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TSB/Document ID: No. 08-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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