Service

Technical Information

2025

ENU

WSG1

1

WSG1 - 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:

2025

Vehicle Type:

911 Carrera GTS (992)

Concerns:

Thermal management control unit

Cause:

Due to the current diagnostic design for monitoring the pressure and temperature values, it is possible that
the two sensors on the refrigerant circuit may be incorrectly diagnosed as faulty on the affected vehicles.
As a result, the malfunction indicator light in the instrument cluster will be activated, although there is no
fault present.

Action:

Re-code the thermal management control unit with the latest PIWIS Tester software release.
Information
The minimum programming requirement is the PIWIS Tester software release: 43.400.025 (or higher).

Affected
Vehicles:

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

Required tools
Tools:

•
•

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 90 A. For further information about the
battery chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689
Charging vehicle electrical system battery'

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Technical Information

2025

Re-coding 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 '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester '
Specific information on control unit coding as part of this campaign
Required PIWIS Tester software release:

43.400.025 (or higher)

Type of control unit coding:

Control unit coding using the "Automatic coding"
function of the control unit:
"Thermal management" (TME) control unit – "Coding
/ programming" menu – "Automatic coding" function.

Coding sequence:

Read and follow the information and instructions on
the PIWIS Tester during the guided coding sequence.
Do not interrupt the coding process.
When coding is complete, the message "Coding has
been completed successfully" is displayed, and a tick
appears in the "Status" box.

2

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Coding duration (up to):

2 minutes

Procedure if control unit coding is not
successful:

Repeat control unit coding.

Read out and delete all control unit fault memories.
2.1

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

2.2

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

3

End diagnostic application, end readiness for operation (ignition off) and disconnect the PIWIS Tester
from the vehicle.

4

Switch off and disconnect the battery charger.

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Technical Information
5

ENU

WSG1

1

Attach Recall Proof of Completion label to the front lid (California Porsche Centers only).
Instructions for attaching labels
•
•
•
•

6

2025

Surfaces on which you intend to attach the label must be clean, dry and free from grease and oil
residues.
Before attaching the label, clean the surfaces using a suitable cleaning agent and a clean,
grease-free and lint-free cloth.
This label must not be affixed over existing label.
Attach label only at the specified positions.

5.1

Fill out the Recall Proof of Completion label
⇒ Recall Proof of Completion Label fully
and correctly. This includes the recall code
“WSG1”, your Porsche Center code and the
repair date.

5.2

Clean the surface in the lower area on the front
lid at the left-hand side in direction of travel
at which the Recall Proof of Completion label
Þ Proof of Completion
must be attached ⇒
Label: specified position (Exemplary illustration) -arrow- using a suitable cleaning agent
and a clean, grease-free and lint-free cloth.

5.3

Affix Recall Proof of Completion label in the
lower area of the front lid at the lefthand side
Þ Proof of Completion
in direction of travel ⇒
Label: specified position (Exemplary illustration) -arrow-.

5.4

Close front lid.

Recall Proof of Completion Label

Enter campaign in the Warranty and Maintenance
logbook.

Proof of Completion Label: specified
position (Exemplary illustration)

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Technical Information

2025

Warranty invoicing
Information
The stated labor time was determined specifically for carrying out this campaign and includes all necessary
preliminary work and rework. The labor time can differ from the labor time published in the Labor Operation
List in the PCSS.
Scope 1:

Re-coding thermal management control unit
Labor time:
Re-coding thermal management control unit
Includes:
Connect and disconnect battery charger
Connect and disconnect PIWIS Tester
Read out and delete fault memory
Attach Recall Proof of Completion label and provide signed
proof of correction to customer (California Porsche Centers
only)
PNA EMI 000 00

Label
– Recall Proof of
Completion

1 ea.

PNA 999 100 235

Certificate
- Recall Proof of
Correction

1 ea.

Labor time: 21 TU

* California Porsche Centers only:
•
•

For warranty processing, enter the Part No. PNA EMI 000 00 with the designation "label" as a local
part at US$ 0.34 in the warranty claim.
For warranty processing, enter the Part No. PNA 999 100 235 with the designation "certificate" as a
local part at US$ 0.01 in the warranty claim.

Þ Damage number WSG1 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.

© 2025 Porsche Cars North America, Inc.

Aug 12, 2025
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