Service

Technical Information

193/22 ENU

8274

Check Engine Warning Light Active / Fault Memory Entry "P26B100/00CB24" in the Thermal
Management Control Unit (TME): Re-Programming Control Unit (193/22)

8

Revision:

This bulletin replaces bulletin Group 8 193/22, dated February 28, 2023.

Model Year:

As of 2019 up to 2021

Vehicle Type:

Cayenne E-Hybrid (9YA)/Cayenne E-Hybrid Coupé (9YB)/Cayenne Turbo S E-Hybrid (9YA)/Cayenne Turbo
S E-Hybrid Coupé (9YB)

Equipment:

Emissions concept PL7 with alternative. OBD (M No. 0GB)
Emissions concept LEV3 / TIER3 70 (M No. 7CE)
Emissions concept LEV3 / TIER3 125 (M No. 7MU)
Emissions concept C6B w/o RDE (M No. 7CM / 4BD)
Emissions concept C6B w/ RDE (M No. 7CR)

Concerns:

Thermal management control unit (TME)

Information:

•
•

Customers complain that the Malfunction Indicator Lamp (MIL)/ Check Engine Light is on in the
instrument cluster.
The fault memory entry “Directional-control valve for high-temperature circuit – function implausible
(P26B100/00CB24)” is set in the thermal management control unit (TME).

Action required: In the event of a customer complaint and if a fault memory entry is set in the thermal management control
unit (TME), the software version of the thermal management control unit (TME) must be checked and
re-programmed if necessary using the PIWIS Tester with PIWIS Tester software version 41.750.0046 (or
higher) installed.

Required tools
Tool:

•
•
•

Battery charger with a current rating of at least 90 A, e.g. VAS 5908 battery charger 90A. For further
information about the battery chargers to be used, see the corresponding Workshop Manual. ⇒
Workshop Manual '270689 Charging vehicle electrical system and battery'
9900 - PIWIS Tester 3 with PIWIS Tester software version 41.750.046 (or higher) installed
9900 - PIWIS Tester 4 with PIWIS Tester software version 41.750.046 (or higher) installed

Preparatory work
NOTICE
Fault entry in the fault memory or control unit programming aborted, as the case may be, due to low voltage.
•

Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which can result in
one or more fault entries and the abnormal termination of the programming process.

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Jul 22, 2025
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Service
8274

Technical Information

ENU 193/22

Before commencing work, connect a suitable battery charger with a charging current of at least 90 A to the jump-start
terminals in the engine compartment.
NOTICE

Control unit programming will be aborted if the Wi-Fi connection is unstable.
•

An unstable Wi-Fi connection can interrupt communication between the PIWIS Tester II and the vehicle communication
module (VCI). As a result, control unit programming may be aborted.

Þ
⇒

During control unit programming, always connect the PIWIS Tester to the vehicle communication module (VCI) via the
USB cable.
NOTICE

Control unit programming will be aborted if the driver’s key is not detected.
•

If the driver’s key is not detected in the vehicle, programming cannot be started or will be interrupted.

Þ
⇒

Place the driver’s key with the back facing down into the front left storage compartment in the center console to ensure
a continuous radio link between the vehicle and the driver‘s key.

Work Procedure: 1

Carry out general preliminary work for control unit programming as described in ⇒ Workshop Manual
'9X00IN Basic instructions and procedure for control unit programming – chapter on “Preliminary
work”'.

Check software version of the thermal management control unit (TME)
Work Procedure: 1

Jul 22, 2025
Page 2 of 4

Check software version of the thermal management control unit (TME).
1.1

Select ‘thermal management control unit (TME)’.

1.2

Select the ‘Extended identifications’ menu.

1.3

Checking software version of ‘thermal management control unit’ (TME).
1.3.1

If the software version is '0305' (or higher), the TME control unit is already
up-to-date, and the fault must otherwise be found and corrected. Continue with ⇒
Technical Information '9X00IN Concluding work'.

1.3.2

If the software version is earlier than '0304', re-program the thermal management
control unit (TME). ⇒ Technical Information '9X00IN Re-programming thermal
management control unit (TME)'

AfterSales

Service

Technical Information

193/22 ENU

8274

8

Re-programming thermal management control unit (TME)
Information
The procedure described here is based on the PIWIS Tester 3 software version 41.750.046.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the instructions
that must be followed. Deviations may occur with later software versions, for example.
Work Procedure: 1

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 table below.

Required PIWIS Tester software version:

41.750.046 (or higher)

Type of control unit programming:

Control unit programming using the 'Campaign'
function in the additional menu on the PIWIS Tester
by entering a programming code.

Programming code:

E3T8E

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 as soon as
programming and coding is complete.

Programming time (approx):

3 minutes

Software version programmed during this
campaign:

•

Thermal management control unit (TME): 0305

Following control unit programming, the software
version can be read out from the relevant control unit
in the ⇒ ‘Incremented identifications’ menu using
the PIWIS Tester.

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Jul 22, 2025
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Service

Technical Information

ENU 193/22

8274

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

⇒ Workshop Manual '9X00IN Basic instructions and
procedure for control unit programming using the
PIWIS Tester - section on “Fault finding”'.

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

Repeat control unit programming by restarting
programming.

Concluding work
Work Procedure: 1

Carry out general rework for control unit programming as described in ⇒ Workshop Manual '9X00IN
Basic instructions and procedure for control unit programming using the PIWIS Tester - section on
“Rework”'.

Invoicing
For documentation and invoicing in the event of a warranty, state the work items required depending on the
scope of work and the specified PCSS encryption in the warranty claim:
APOS

Labour operation

I No.

19290101

Checking thermal management control unit

19292551

Programming thermal management control unit
PCSS encryption:

Location (FES5)

82740

Directional-control valve

Damage type (SA4)

1611

does not function

References:

⇒ Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS
Tester'

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.

Jul 22, 2025
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