If necessary, perform the vehicle handover according to the menu guidance using the PIWIS Tester.

10 End diagnostic application, end readiness for operation and disconnect P90999 - PIWIS Tester 4 from
vehicle.
11 Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging vehicle electrical system battery'

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

98042540

Checking fault memory entries

98042541

Re-programming HCP4 body electronics main
control unit

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Technical Information

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9804

9

PCSS encryption:
Location (FES5)

98040

Body electronics main control unit

Damage type (SA4)

1142

Incorrect coding

FAQs on control unit programming and coding
Information
If individual programming or rework procedures could not be carried out correctly, please refer to the
Workshop Manual for the basic procedure for control unit programming with the PIWIS tester. ⇒ Technical
Information '9X10IN Basic information and procedure for control unit programming with the PIWIS tester.
Information':
In the event of a fault, always create a log with the PIWIS tester during programming with •P2“.
Work procedure: General:
Fault indication

Cause

Source of
fault

Remedial action

Control unit
programming

The affected control unit
did not respond or did not
respond completely when
the vehicle information
was read out.

Vehicle

•
•
•
•

Cause

Source of
fault

Remedial action

Diagnostic application
crashes (JAVA error
message)

Diagnostic
application

•

Restarting diagnostic
application

The VCI connection
has been aborted
(the diagnosis has no
information on battery
voltage – see the
battery symbol at the
top right on the Tester
display).

VCI has
poor WiFi
connection

•

Restart Tester, reinsert VCI
and try again
Ensure that WiFi connection
is stable, moving vehicle
to a suitable position in
workshop if necessary

USB memory stick not
detected or no change

Infotainment
main control
unit (HCP3)

•

Cancel procedure
Close diagnosis
Terminal 15 change
Restart procedure

Before the update:
Fault indication

AfterSales

•

Pull fuse for Infotainment
main control unit (HCP3)
and wait around 1 minute
(30-amp fuse is located
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on central display after
plugging it in.

•

on passenger side below
A-pillar)
Reinsert fuse for
Infotainment main control
unit (HCP3)

During the update:
Fault indication

Cause

Diagnostic application
crashes (JAVA error
message)

Source of
fault

Remedial action

Diagnostic
application

•
•
•

•

The following fault
occurs at the step
“Attempting to connect
to SOD”: “The release
versions of Tester and
PIUS do not match.”

PIWIS Tester 4 did not
receive the required
release update. Since the
PIUS installs the updates
automatically, the release
versions no longer match.

PIWIS Tester
and PiUS

PIWIS Tester 4
cannot establish
communication with
diagnostic tester;
error message on first
attempt to establish
communication

Date/time in vehicle
is incorrect after
disconnecting/reconnecting 12-V battery
(terminal 30)

Vehicle

•
•

•
•
•

AfterSales

Install current release on
PIWIS Tester 4
Check availability of current
release on PiUS workshop
server

Correct date/time in vehicle:

•

Apr 24, 2025
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Checking update progress in
vehicle is mandatory
No ignition change during
update
Do not restart Tester until
update has been completed
in vehicle (“Messages” tile
--> installation “successful”)
When the update has
finished in the vehicle,
verify that the update is
complete. To do this, restart
the integration test using
the PIWIS Tester.

Open “Control unit
overview”
Access “Gateway HCP5”
main control unit
Open “Service / Maintenance” menu
Select and execute “Set
time” menu item

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247/24 ENU

9

When the update
calculation result is
displayed, the following
fault occurs in all
control units to be
programmed/coded:
“Fault in determining
target state for
coding/programming”

Fault while calculating in
backend system

Backend
system

On PIWIS Tester 4, the
progress of the vehicle
update is not shown
until approx. 27% has
been completed.

Diagnostic service
(RPC+) will not forward
the progress of the
update to the Tester
until it is approx. 27%
complete.

Vehicle

•

Wait until progress is
displayed

Vehicle,
GOBW

•

•
•
•
•

Final integration test reports
a communication error
Pull fuse from affected
control unit
Remove fuse
Wait 30 seconds
Re-insert fuse
Re-attempted update
Repeat routine

Charging communication 1 (J1245) or
charging communication
2 (J1246) in update
attempt not OK -->
communication error.

Programming or coding
aborts at approx. 30%.

•

9804

•

•

Lock vehicle and wait for bus
rest
Repeat update

Cleaning of the
systems in the
background prevents the
programming or coding
from being completed.

Backend
system

•

Cause

Source of
fault

Remedial action

Vehicle

•

After the update:
Fault indication
Delete the fault from the
fault memory.

AfterSales

Fault can be ignored

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The VCI connection
has been aborted
(the diagnosis has no
information on battery
voltage – see the
battery symbol at the
top right on the Tester
display).

VCI has
poor WiFi
connection

•

Diagnostic application
crashes (JAVA error
message)

Diagnostic
application

•

Restarting diagnostic
application

•
•

Switch ignition off and on
Re-reading and deleting
fault memory

Passive fault memories
from high-voltage
control units cannot
be erased.

•

Restart Tester, reinsert VCI
and try again
Ensure that WiFi connection
is stable, moving vehicle
to a suitable position in
workshop if necessary

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.

Apr 24, 2025
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