No. 92-25-1 Service Bulletin/Repair Instructions

Service
Technical Information
92/25
ENU
9125
Various Complaints in Connection with the External Communication Control Unit/ No Stored Fault

Memory Entries (92/25)
9
Model Line:
Taycan (Y1A/Y1B/Y1C)
Model Year:
As of 2020
Concerns:
External communication control unit (Connect control unit)
Information:
The customer has various complaints in connection with the external communication control unit, such as

restrictions on Connect services.

No fault memory entry is stored in the fault memory of the external communication control unit:
Action:
If there is a customer complaint, reset and start the external communication control unit.

Information

The test steps listed in this measure describe the correct procedure for performing a reset of the external

communication control unit and must be carried out one after the other.

After each successfully performed test step, the customer complaint must be checked again.
Information

The action described in this Technical Information is only valid if no fault memory entries are stored in the

external communication control unit.
Required tools

Tool:
•

•
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

Charge battery and vehicle electrical system'
Resetting and starting external communication control unit

Information

In the event of faults or functional restrictions, log in using the Porsche ID and using the security code in the

PCM.

Work Procedure: 1
Connect and switch on the battery charger.
⇒ Workshop Manual '270689 Charging the battery/vehicle electrical system'
AfterSales
Jan 15, 2026

Page 1 of 5
9
Service

9125
ENU
Technical Information
92/25
2
Place the original remote control in the emergency start tray.
3
Connect P90999 - Porsche Tester 4, establish readiness for operation and start the diagnostic application.
4
Perform the integration test using the automated procedure with Porsche Tester.
5
4.1
Start the integration test with Porsche Tester.
4.2
Check Connect control unit for mandatory updates and run any that are available.
4.3
Check the Gateway control unit, Connect control unit and Over-the-Air (OTA) control unit for

optional updates and run any that are available.
Check and evaluate the customer complaint again.

Assessment

( )
Customer complaint no longer exists.
Action

End of action.

•

•
✗)

(✗
Customer complaint still exists.
End the diagnostic application, end readiness

for operation and disconnect P90999 Porsche Tester 4 from the vehicle.

Switch off and disconnect the battery

charger.
Continue with Step ⇒ 6.
or

No updates available.

6
7
Jan 15, 2026

Page 2 of 5
Deactivate flight mode.

6.1
In the Overview, select the "Connect" control unit. Press •F12“ to continue.

Should a Vehicle Analysis Log (VAL) be created? Press •F11“ to continue.
6.2
Select “Service/repairs”.
6.3
Select “Deactivate flight mode”. Press •F12“ to continue.

6.3.1
Read and follow the instructions and information on the Tester.
6.3.2
Deactivate flight mode according to menu guidance.
6.4
Return to the “Overview” of all control units.
6.5
In the “Overview”, press •F7“ to switch to the “Additional menu”.
6.6
Read out all fault memories; process and delete existing faults if necessary.
Check and evaluate the customer complaint again.
AfterSales
Service
Technical Information
92/25

Assessment
( )
Customer complaint no longer exists.
8
9
9
End of action.
•

Customer complaint still exists.
9125
Action

•
✗)

(✗
ENU
End the diagnostic application, end readiness

for operation and disconnect P90999 Porsche Tester 4 from the vehicle.

Switch off and disconnect the battery

charger.
Continue with Step ⇒ 8.
Carry out a soft reset of the external communication control unit.

8.1
Select the Connect control unit in the “Overview”) menu), and confirm with •F12“ (“Next”).
8.2
In the “Control links check” menu, select “Control links”, and confirm with •F12“ (“Next”).
8.3
Select the “Control unit, unexpected reset” function and press •F12“ (“Next”) to confirm.
8.4
Start the routine by pushing •F8“ (‘Start’) and follow as per menu.
8.5
The Connect control unit is fully reset.
Check and evaluate the customer complaint again.

Assessment

( )
Customer complaint no longer exists.
Action

End of action.

•

•
✗)

(✗
Customer complaint still exists.
End the diagnostic application, end readiness

for operation and disconnect P90999 Porsche Tester 4 from the vehicle.

Switch off and disconnect the battery

charger.
Continue with Step ⇒ 10.
10 Carry out a hard reset on the external communication control unit.

Information

For vehicles with active VTS (Vehicle Tracking System)

Before removing the external communication control unit, it must be ensured that VTS workshop mode

is activated.

10.1
Remove the external communication control unit.

⇒ Workshop Manual '912519A3 Removing and installing external communication control unit'
AfterSales
Jan 15, 2026

Page 3 of 5
9
Service

9125
ENU
11
Technical Information
92/25
10.2
Remove the internal battery of the external communication control unit and leave it separate

from the external communication control unit for at least 15 minutes.

⇒ Workshop Manual '912519A1 Removing and installing battery for external communication

control unit'
10.3
After waiting, install the internal battery of the external communication control unit.

⇒ Workshop Manual '912519A1 Removing and installing battery for external communication

control unit'
10.4
Install and re-teach the external communication control unit.

⇒ Workshop Manual '912519A3 Removing and installing external communication control unit'

and

⇒ Workshop Manual '912555A3 Replacing external communication control unit'
Check and evaluate the customer complaint again.

Assessment

( )
Customer complaint no longer exists.
Action

End of action.

•

•
✗)

(✗
Customer complaint still exists.
End the diagnostic application, end readiness

for operation and disconnect P90999 Porsche Tester 4 from the vehicle.

Switch off and disconnect the battery

charger.
Continue with Step ⇒ 12.
12 Carry out a hard reset on the over-the-air (OTA) control unit.
13
Jan 15, 2026

Page 4 of 5
12.1
Remove the over-the-air (OTA) control unit and leave it separate from the vehicle for at least 15

minutes.

⇒ Workshop Manual '919819A1 Removing and installing over-the-air control unit'
12.2
After waiting, install the over-the-air (OTA) control unit.

⇒ Workshop Manual '919819A1 Removing and installing over-the-air control unit'
12.3
Re-teach the Over-the-Air (OTA) control unit

⇒ Workshop Manual '919855 Replacing over-the-air control unit'
Check and evaluate the customer complaint again.
AfterSales
Service
Technical Information
92/25

Assessment
( )
9125
9
Action
Customer complaint no longer exists.
End of action.

•

•
✗)

(✗
ENU
Customer complaint still exists.
End the diagnostic application, end readiness

for operation and disconnect P90999 Porsche Tester 4 from the vehicle.

Switch off and disconnect the battery

charger.
The customer complaint can be triggered by the

external communication control unit.

Replace the external communication control unit.

⇒ Workshop Manual '912555A3 Replacing

external communication control unit'
Labor position and PCSS encryption

Labor position:

APOS
Labor operation
I No.
91252535
Performing integration test
91252536
Performing vehicle handover (diagnostics system)
91252537
Carry out a soft reset of the external communication control unit.
91252538
Carrying out hard reset on external communication

control unit
91252539
Carrying out hard reset on over-the-air (OTA)

control unit
91255500
Replacing external communication control unit

PCSS encryption
Location (FES5)
91250
External communication control unit
Damage type (SA4)
4092
Vehicle not accessible
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
Jan 15, 2026

Page 5 of 5

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