NHTSA ID Number: 11029160
Manufacturer Communication Number: No. 117-25
TSB/Document Date: 2026-03-02
Summary
Technical information for Additional Measure for Working on the High-Voltage Battery
to Prevent Corrosive Leakage: Observe Specified Approach
Service
Technical Information
117/25 ENU
2708
2
Additional Measure for Working on the High-Voltage Battery to Prevent Corrosive Leakage: Observe
Specified Approach (117/25)
Model Line:
Taycan (Y1A/Y1B/Y1C)
Model Year:
As of 2020 up to 2025
Concerns:
Working on high-voltage battery
Information:
Avoiding corrosive leakage at susceptible areas of the high-voltage battery.
Action:
For all work on the high-voltage battery (e.g. cell module change, removal and installation or replacement
requirement) and if Teroson MS polymer is not yet applied at the susceptible areas for corrosive leakage,
rework the defined areas on the high-voltage battery with Teroson MS polymer.
Information
Before starting subsequent work, check the variant of the high-voltage battery. Due to a previous
replacement requirement for the high-voltage battery, a high-voltage battery variant of model year 2025 can
be installed from model year 2020.
The subsequent work on the defined areas differs between the two high-voltage battery variants.
1
Visual differentiation of the high-voltage battery variants
– High-voltage battery variant 1: Model year 2020 – 2024
AfterSales
Feb 19, 2026
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2
Service
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Technical Information
117/25
– High-voltage battery variant 2: Model year from 2025 (can also be installed in vehicles of model year 2020 – 2024
due to replacement requirements)
Procedure for reworking the corresponding high-voltage battery:
•
High-voltage battery variant 1: ⇒ Technical Information 'Applying wax at critical points of the
high-voltage battery (variant 1)'
High-voltage battery variant 2: ⇒ Technical Information 'Applying wax at critical points of the
high-voltage battery (variant 2)'
•
Date of
Introduction:
Since CW35/2025, Teroson MS polymer is already applied to the defined areas of the high-voltage battery in
series production.
Required material
Part Info:
Part No.
Designation
Quantity
00004330532
⇒ Sealing compound
– Teroson MS polymer
1 piece(s)
Applying Teroson MS polymer to defined areas of the high-voltage battery (variant 1)
Information
Reworking is described on one side as an example and must also be carried out independently on the other
side. Reworking is identical on both sides.
Information
Þ
Only apply Teroson MS polymer on the outer surface ⇒
Bushing on high-voltage battery -1-of the bushings, no
Þ Bushing on high-voltage
application to the upper edge ⇒
battery -2- of the bushings.
Information
Requirement for the Teroson MS polymer seal:
Feb 19, 2026
Page 2 of 16
•
The film must be applied evenly and fully
•
The applied sealing film layer must be continuous and
without interruptions
AfterSales
Bushing on high-voltage battery
Service
Technical Information
117/25 ENU
2708
2
Overview:
1 – 6 – Rework areas
Work Procedure: 1
Critical points for corrosive leaks (rework areas)
Þ Overview area 1 -1-using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Feb 19, 2026
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Service
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Technical Information
117/25
Overview area 1
2
Feb 19, 2026
Page 4 of 16
Þ Overview area 2 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 2
3
Þ Overview area 3 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Feb 19, 2026
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Service
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Technical Information
117/25
Overview area 3
4
Feb 19, 2026
Page 6 of 16
Þ Overview area 4 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 4
5
Þ Overview area 5 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Feb 19, 2026
Page 7 of 16
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Service
2708
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Technical Information
117/25
Overview area 5
6
Feb 19, 2026
Page 8 of 16
Þ Overview area 6 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 6
Applying Teroson MS polymer to defined areas of the high-voltage battery (variant 2)
Information
Reworking is described on one side as an example and must also be carried out independently on the other
side. Reworking is identical on both sides.
Information
Þ
Only apply Teroson MS polymer on the outer surface ⇒
Bushing on high-voltage battery -1-of the bushings, no
Þ Bushing on high-voltage
application to the upper edge ⇒
battery -2- of the bushings.
Information
Requirement for the Teroson MS polymer seal:
•
The seal must be applied evenly and fully
•
The applied sealing film must be continuous and
without interruptions
AfterSales
Bushing on high-voltage battery
Feb 19, 2026
Page 9 of 16
2
Service
2708
ENU
Technical Information
117/25
Overview:
1 – 6 – Rework areas
Work Procedure: 1
Feb 19, 2026
Page 10 of 16
Critical points for corrosive leaks (rework areas)
Þ Overview area 1 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 1
2
Clean area using water for initial cleaning, then isopropanol for final finish. Apply Teroson MS polymer
with a brush once the isopropanol has completely dried.
AfterSales
Feb 19, 2026
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Service
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Technical Information
117/25
Overview area 2
3
Feb 19, 2026
Page 12 of 16
Þ Overview area 3 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 3
4
Þ Overview area 4 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Feb 19, 2026
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2
Service
2708
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Technical Information
117/25
Overview area 4
5
Feb 19, 2026
Page 14 of 16
Þ Overview area 5 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
AfterSales
Service
Technical Information
117/25 ENU
2708
2
Overview area 5
6
Þ Overview area 6 -1- using water for initial cleaning, then isopropanol for final finish. Apply
Clean area ⇒
Teroson MS polymer with a brush once the isopropanol has completely dried.
Þ Overview area
Apply Teroson MS polymer approx. 30 mm / 1.18 in deep in the inner area of the gaps⇒
6 -2-.
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Overview area 6
Labor position and PCSS encryption
Labor position:
APOS
Labor operation
27084991
Reworking high-voltage batteries
I No.
PCSS encryption:
Location (FES5)
27080
Damage type (SA4)
9735
Repair according to PAG instructions
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.
Feb 19, 2026
Page 16 of 16
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TSB/Document ID: No. 117-25
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-19
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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