No. 269-22 Service Bulletin/Repair Instructions

Service
Technical Information
269/22 ENU WNW2
2
WNW2 - Re-Programming High-Voltage Battery Control Unit (BMCe) (Workshop/OTA

Update)

Important:
CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be

programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5V and 14.5V

during this programming. Failure to maintain this voltage could result in damaged control unit(s). Damage

caused by inadequate voltage during programming is not a warrantable defect. The technician must

verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document the

actual voltage on the repair order.
Model Year:
As of 2020 up to 2023
Model Line:
Taycan (Y1A/Y1B/Y1C)
Concerns:
High-voltage battery control unit (BMCe)
Cause:
Optimized software is available for the high-voltage battery control unit. This software update

revises the fast-charging function and enables the short charging times typical of the Taycan to

be maintained over its lifetime even with the predominant utilization of fast-charging stations

greater than 50 kW.
Measures:
Re-program the high-voltage battery control unit (BMCe) with the latest PIWIS Tester software version.

•
Minimum requirement: Version 41.600.025
Information

OTA update

Please note that the OTA software updates are usually predominantly installed via the Porsche Communication Management (PCM), provided that the software package for the campaign has been downloaded

to the vehicle over-the-air (Scope 1) and the update is displayed in the PCM "Updates" menu.

For vehicles on which the preconditions for performing a software update are not met at the time of publication (Online software update in MyPorsche deactivated/Privacy Mode), the OTA update is not displayed

in the vehicle (PCM). These vehicles are therefore assigned to Scope 2 of this campaign and must be

updated with the current PIWIS Tester software.

Scope 1: Over-the-Air (OTA) software update via PCM — Online software update consent active in

MyPorsche.

Scope 2: Re-program the high-voltage battery (BMCe) control unit using the PIWIS Tester — Online

software update is deactivated through MyPorsche, logged into Privacy Mode or guest user.

If the vehicle is assigned Scope 1 and the customer would like your dealer to perform the

update, the update can be installed via the PCM or with the PIWIS Tester via integration test.

If your dealer updates any vehicle assigned to Scope 1, please send a PRMS Warranty /

Campaigns Support ticket to Mitchell Grasser.
AfterSales
Jul 21, 2023

Page 1 of 4
2
Service
Affected

Vehicles:
Technical Information
ENU 269/22
WNW2
Only vehicles assigned to the campaign (see also PCSS Vehicle Information)
Required tools

Tools:
•

•
9900 - PIWIS Tester 4

Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90 A
Re-programming high-voltage battery control unit (BMCe)

Work

Procedure:
Information

Before starting programming, pay particular attention to the following:

•
Place original remote control in emergency start tray (note the position).
•
The PIWIS Tester must not be charged using the cigarette lighter!
1
The basic procedure for control unit programming is described in the Workshop Manual 

Workshop Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS

Tester'.

Required PIWIS Tester software version:
41.600.025 (or higher)
Type of control unit programming:
Control unit programming using the ‘Automatic

programming’ function of the high-voltage

battery control unit (BMCe).
Programming sequence:
Read and follow the information and

instructions on the PIWIS Tester during the

guided programming sequence.

Do not interrupt programming and coding.

A backup documentation process for the

re-programmed software versions starts after

programming and coding is complete.
Programming time (approx.):
Jul 21, 2023

Page 2 of 4
AfterSales
7 minutes
Service
Technical Information
269/22 ENU WNW2
Software version programmed during this

campaign:
•
2
High-voltage battery control unit (BMCe):

1644
Following control unit programming, the

software version must be verified in the BMCe

"Extended identifications” menu.

Procedure in the event of error messages

appearing during the programming sequence:
 Workshop Manual 'Basic instructions and
Procedure in the event of a termination in the

control unit programming:
Repeat control unit programming by restarting

programming.
Integration test procedure:
•
procedure for control unit programming using

the PIWIS Tester'
•
2
The integration test shows a green result

independently of the necessary campaign

The campaign WNW2 must still be

carried out
Press •F3“ to start the integration test in the control unit selection.

All affected control units should now be successfully re-programmed or checked in the control unit

overview and in their status.

Information

If a deviation in the integration test is still indicated despite programming being carried out, this must

be repeated. If the deviation persists, contact Technical Support.
3
Check that the BMCe Control Unit was programmed to Software level 1644. If it was not, perform

Automatic Programming of the BMCe Control Unit to ensure that the SW Update was completed.

Information

Connect the PIWIS Tester to a network as soon as you can and log into the PPN in order to transfer

the backup documentation created during this campaign to the PAG systems.
4
Exit the diagnostic application.

4.1
End readiness for operation (switch off ignition).
4.2
Disconnect the PIWIS Tester from the vehicle.
5
Switch off and disconnect the battery charger.
6
Enter the campaign in the Warranty and Maintenance booklet.
AfterSales
Jul 21, 2023

Page 3 of 4
2
Service

WNW2
Technical Information
ENU 269/22
Warranty processing

Scope 1:
Over-the-Air (OTA) software update via PCM (no invoicing possible)
Scope 2:
Re-program control unit for high-voltage battery (BMCe) using the PIWIS tester

Labor time:

Re-programming high-voltage battery control unit (BMCe)

Includes:

Connecting and disconnecting battery charger

Connecting and disconnecting PIWIS Tester
Labor time: 53 TU
 Damage code WNW2 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.
© 2023 Porsche Cars North America, Inc.
Jul 21, 2023

Page 4 of 4
AfterSales

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