Service

Technical Information

177/23 ENU

WPR0

2

WPR0 - Re-Coding Thermal Management 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.

Model Year:

As of 2020 up to 2023

Model Line:

Cayenne (9YA/9YB)

Concerns:

Thermal management control unit

Cause:

Due to the current diagnostic design for monitoring the cooling water changeover valve
(UVW3), it is possible that the cooling water changeover valve (UVW3) is incorrectly diagnosed
as defective on the affected vehicles.
As a result, the Check Engine light in the instrument cluster will be activated, although there is no
mechanical or electrical fault present.

Action:

Re-code the TME control unit with the latest PIWIS Tester software release.
Minimum requirement: Release 42.300.030

Affected
Vehicles:

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

Required tools
Tool:

•
•

P90999 - P90999 - PIWIS Tester 4
Battery charger with a current rating of at least 90 A, e.g., VAS 5908 battery charger 90 A

Re-code thermal management control unit
Work Procedure: 1

Re-code thermal management control unit.
The basic procedure to be followed for coding the control unit is described in the Workshop Manual:

 Workshop Manual 'Basic instructions and procedure for control unit programming using the PIWIS
Tester'

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Nov 15, 2023
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Service

Technical Information

ENU 177/23

WPR0

Specific information on control unit coding as part of this campaign
Required PIWIS Tester software release:

42.300.030 (or higher)

Type of control unit coding:

Control unit coding using the ‘Automatic coding’
function for the control unit:
‘Thermal management’ (TME) control unit –
‘Coding / programming’ menu – ‘Automatic
coding’ function.
Read and follow the information and instructions
on the PIWIS Tester during the guided coding
sequence.

Coding sequence:

Do not interrupt the coding sequence.
When coding is complete, the message ‘Coding has
been completed successfully’ is displayed and a tick
appears in the “Status” box.
Procedure if control unit coding is not
successful:
2

3

Repeat control unit coding.

Read out and delete all control unit error memories.
2.1

Press •F7“ in the control unit selection screen (‘Overview’ menu) to call up the Additional
menu.

2.2

Select the function “Read all error memories and delete if necessary” and press •F12“
(‘Next’) to confirm.

Enter campaign in the Warranty and Maintenance logbook.

Warranty processing
Scope 1:

Labor time:
Re-code thermal management control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out and deleting fault memories
 Damage number WPR0 066 000 1

Nov 15, 2023
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Labor time: 23 TU

Service

Technical Information

177/23 ENU

WPR0

2

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.

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Nov 15, 2023
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