(✗

Additional coolant pump for
low-temperature system (P2) cannot
be activated.

Continue with Step ⇒ 2.

Check production date of high-voltage battery 2.0.
To do this, read out the value "Vehicle central information system (FAZIT) - identification" from the
Extended identifications menu for the high-voltage battery 2.0 control unit.
Information
Example of measured value:
•

MZS-MST25.09.2325560144

The first 6 digits are the production date. In this example 25.09.2023.
Assessment
•
•

Action

Production date of the high-voltage
battery 2.0 is 07/27/2025 or later

Continue troubleshooting otherwise.

Production date of the high-voltage
battery 2.0 is 07/26/2025 or earlier

Check signal line for additional coolant pump for
low-temperature system (P2)
Continue with. ⇒ Technical Information '270689A4
Check signal line for additional coolant pump for
low-temperature system (P2)'

End of action.

Check signal line for additional coolant pump for low-temperature system (P2)
Work Procedure: 1

2
3

Observe general warning notes for working on the high-voltage vehicle electrical system.
⇒ Workshop Manual '2X00INB2 General warning notes for working on the high-voltage vehicle electrical system'
Perform deactivation of high-voltage system.

⇒ Workshop Manual '277583A1 Deactivation/start of the high-voltage system'
Complete the documentation.
Procedure, see: ⇒ Workshop Manual '2775INA4 Test log: Verifying isolation from the power supply'

AfterSales

Mar 30, 2026
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2

Service

Technical Information

ENU 120/25

2708

Information
The following points must be observed to expose the high-voltage battery:
•

Do not disconnect high-voltage lines

•

Do not disconnect cooling hoses

4

Expose high-voltage battery 2.0
Procedure see: ⇒ Workshop Manual '270819A8 Removing and installing high-voltage battery 2.0'

Information
To expose the additional coolant pump for the low-temperature system (P2), the following points must be
observed:
•

Only the electric plug connection must be made accessible

•

Start catalytic converter does not have to be removed

•

Do not disconnect cooling hoses

5

Expose additional coolant pump for low-temperature system (P2).
For vehicles with V6 engine (M-no. T9I):
⇒ Workshop Manual '194519 Remove and install additional coolant pump (low-temperature system
P2) - 0K3,T9I'
For vehicles with V8 engine (M-no. TB5):
⇒ Workshop Manual '194519D7 Remove and install additional coolant pump (low-temperature system
P2) - 0K3,TB5'

6

Release and disconnect electric plug connection on
high-voltage battery 2.0

Electric plug connection on
high-voltage battery 2.0

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AfterSales

Service

Technical Information

120/25 ENU

7

Unlock and disconnect electric plug connection of
additional coolant pump for low-temperature system
Þ Additional coolant pump for low-temperature
P2⇒
system P2 -2-.

8

Perform resistance test on signal line for additional
coolant pump for low-temperature system (P2).
8.1

Set the multimeter to “resistance test”.

8.2

Position measuring tip 1 of multimeter on
electric plug connection for high-voltage
battery pin 6 (blue / green).

8.3

9

2708

2

Additional coolant pump for
Position measuring tip 2 of multimeter on
low-temperature system P2
electric plug connection for additional coolant
pump for low-temperature system P2 pin 2 (blue / green).

Assess measured value.
Assessment
( )

Resistance of the signal line is normal or
unremarkable (< 0.5 Ω).

Action
Signal line OK
•
•

✗)
(✗

Resistance of the signal line is too high
or signal line is interrupted (> 0.5 Ω /
O.L.).

Connect electric plug connection for additional coolant pump for low-temperature
system P2, until it locks securely.
Continue with ⇒ Technical Information
'194519D7 Check high-voltage battery 2.0
control unit'.

Signal line damaged or interrupted.
Locate damage, repair line and then complete the
vehicle again.
End of action.

Checking high-voltage battery 2.0 control unit and replacing if necessary
Work Procedure: 1

Remove high-voltage battery 2.0 control unit.

⇒ Workshop Manual '279419A3 Removing and installing high-voltage battery 2.0 control unit'

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Page 7 of 9

2

Service

Technical Information

ENU 120/25

2708
2

Þ Plug contact for
Check plug contact pin 18 ⇒
high-voltage battery 2.0 control unit -1-for damage.

Plug contact for high-voltage
battery 2.0 control unit
Assessment
( )

Plug contact is not damaged.

Action
High-voltage battery 2.0 control unit OK
Continue troubleshooting otherwise.
End of action.

✗)
(✗

Plug contact is damaged.

High-voltage battery 2.0 control unit faulty.
Exchange high-voltage battery 2.0 control unit.

⇒ Workshop Manual '279455A4 Replace
high-voltage battery 2.0 control unit'
Then complete the vehicle again.
End of action.

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

19450140

Check additional coolant pump low-temperature
system, (activation)

19450141

Check additional coolant pump low-temperature
system (activation, read measured values)

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I No.

AfterSales

Service

Technical Information

120/25 ENU

APOS

Labor operation

19450142

Check additional coolant pump low-temperature
system (signal line, V6)

19450143

Check additional coolant pump low-temperature
system (signal line, V8)

27940140

Check control unit high-voltage battery (V6,
Cayenne 9YA)

27940141

Check control unit high-voltage battery (V6,
Cayenne 9YB)

27940142

Check control unit high-voltage battery (V8,
Cayenne 9YA)

27940143

Check control unit high-voltage battery (V8,
Cayenne 9YB)

27945527

Replace high-voltage battery control unit

2708

2

I No.

PCSS encryption:
Location (FES5)

27080

High-voltage battery

Damage type (SA4)

4011

Loose contact, contact fault

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.

© 2026 Porsche Cars North America, Inc.

AfterSales

Mar 30, 2026
Page 9 of 9