Service

Technical Information

116/23 ENU

WPK0

4

WPK0 - Re-Programming PSM Control Unit (Workshop Campaign)

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 13.5 volts and 14.5
volts 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.
Change overview:
Release

Date

Change

1

04/08/2024

•

First publication

2

04/23/2024

•

Correction of Action steps under 1.4

3

05/17/2024

•

Correction of contact information under 1.4

4

08/09/2024

•
•

Added information about ARBO campaign
Update of Work Instructions

Model Year:

As of 2020 up to 2024

Model Line:

Taycan (Y1A / Y1B / YBC)

Concerns:

Porsche Stability Management (PSM)

Cause:

An optimized software is available for the Porsche Stability Management (PSM) control unit.
This update optimizes the brake pedal feel on recuperative and hydraulic braking.

Action:

Check hydraulic unit and re-program PSM control unit using an updated data record.
Information
Please note that all WPK0 vehicles are also affected by the ARB0 campaign. This technical information was therefore adapted as part of the ARB0-campaign publication.
It is also absolutely necessary that the ARB0 campaign is carried out first and then the WPK0
campaign. In the event that the ARB0 campaign is carried out at a later point in time and the WPK0 is still
open, the implementation of the WPK0 campaign should also be postponed until the planned date. If the
WPK0 campaign has already been completed, it does not have to be carried out again.
The following must be observed for vehicles on which the ARB0 campaign has already been carried out in
the past and the present WPK0 campaign is still open:

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Aug 9, 2024
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Service

Technical Information

ENU 116/23

WPK0
•

The ARB0 campaign was carried out max. one month ago ( 1 month): In addition to
programming the PSM control unit, the brake system must first be ventilated using the ventilation
routine for electric brake boosters (eBKV) and then using the Porsche Stability Management
(PSM) ventilation routine (calculation scope 6).

In principle, the implementation of the “Functional testing of the hydraulic unit” is omitted.
Minimum requirement: Release 42.400.050
Affected
Vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

Required materials
Material:

Required materials (usually already available in the Porsche Center or locally sourced):
Part No.

Designation

Quantity

00004321086

 Brake fluid, 30 liter/ 7.9 gal
container container

Quantity as required
(approx. 2.5 liter/ 0.66 gal
required per vehicle)

Required tools
Tool:

•
•
•
•
•

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P90999 - P90999 - PIWIS 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 90A
Torque wrench, 6 – 50 Nm (4.5 – 37 ftlb.), e.g. VAG 1331A Torque wrench, 6-50 Nm (4.5-37
ftlb.)
Torque wrench, 150 – 800 Nm (111 – 592 ftlb.), e.g. VAG 1601 Torque wrench, 150 - 800 Nm
(111 - 592 ftlb.)
Suitable bleeding device for brake fluid, e.g., VAS 6860 - Brake filling and bleeding equipment

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Service

Technical Information

116/23 ENU

WPK0

4

Re-program the PSM control unit and bleed the brake system (PSM)
Work
Procedure:

Information
For vehicles on which the ARB0 campaign has already been carried out, the following must be
observed:
•

The ARB0 campaign was carried out max. one month ago ( 1 month): First, bleed the brake
system with the bleeding routine for electric brake booster (EBB). Then carry out campaign
action according to the description and continue with work step 1 (scope 6 invoicing).

In principle, the implementation of the “Functional testing of the hydraulic unit” is omitted.
1

Bleed the brake system with the bleeding routine Porsche Stability Management (PSM).

 Workshop Manual '470107 Bleeding brake system'
2

The basic 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'.
For specific information on control unit programming during this campaign, see the table
below.

Required PIWIS Tester software release:

42.400.050 (or higher)

Integration test procedure:

•
•

The integration test shows a green result
independently of the necessary campaign
The WPK0 campaign must still be carried
out

Type of control unit programming:

Control unit programming using the “Automatic
programming” function in the PSM control unit.

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 releases starts as soon
as programming and coding is complete.

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Technical Information

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WPK0

Programming time (approx.):

12 minutes

Software release programmed during this
campaign:

•

Procedure in the event of error messages
appearing during the programming sequence:

 Workshop Manual '9X00IN Basic instructions

Procedure in the event of a termination in the
control unit programming:

Repeat control unit programming by restarting
programming.

3

PSM control unit: 0190

Following control unit programming, the software
release can be read out from the relevant control
unit using the PIWIS Tester in the menu  “Incremented identifications”.

and procedure for control unit programming using
the PIWIS Tester'

Read out and delete all control unit fault memories.
3.1

In the control unit selection (“Overview menu”) press •F7“ to call up the Additional menu.

3.2

Select the function “Read all fault memories and erase if necessary” and press •F12“
(“Next”) to confirm.
Information
If control units are found to have faults that are not caused by control unit programming,
these must first be found and corrected. This work cannot be invoiced under the
workshop campaign number.

4

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 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.

Aug 9, 2024
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5

Exit the diagnostic application. Switch off ignition.

6

Switch off and disconnect the battery charger.

7

Enter the campaign in the Warranty and Maintenance logbook.

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Service

Technical Information

116/23 ENU

WPK0

4

Warranty processing
Scope 1-4:

Not valid.

Scope 5:

Re-programming the PSM control unit – Bleeding the brake system with bleeding routine PSM
Labor time:
Re-programming PSM control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Removing and installing wheels
Bleeding brake system (PSM)
Reading out and deleting fault memories

Labor time: 141 TU

Required materials:
00004321086

Brake fluid, 30 liter/ 7.9 gal
container container

0.09 pieces
(approx. 2.5 liter/ 0.66 gal)

 Damage Number WPK0 066 000 1
Scope 6:

Only to be invoiced if the ARB0 campaign was carried out more than one month ago (> 1
month):
Re-programming the PSM control unit – Bleeding the brake system with bleeding routines EBB and PSM
Labor time:
Re-programming PSM control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Removing and installing wheels
Bleeding brake system (EBB and PSM)
Reading out and deleting fault memories

Labor time: 161 TU

Required materials:
00004321086

Brake fluid, 30 liter/ 7.9 gal
container container

0.14 pieces
(approx. 4 liter/ 1.05 gal)

 Damage Number WPK0 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.

© 2024 Porsche Cars North America, Inc.

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