Service

Technical Information

198/24 ENU

ARB7

2

ARB7 - Re-Programming High-Voltage Battery Control Unit (BMCe) (Recall 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 2024

Model Line:

Taycan (Y1A / Y1B / Y1C)

Concerns:

High-voltage battery control unit (BMCe)

Cause:

Updated software is available for the high-voltage battery control unit (BMCe) in the Taycan.
This update optimizes the on-board diagnostic function of the affected vehicles to improve the detection of
potential deviations within the high-voltage battery.
With this updated software, in a yellow warning message will appear immediately in the instrument cluster in
the case of detected deviations.

Action:

•
•

Re-programming the high-voltage battery control unit (BMCe) with the latest PIWIS Tester software
release
Minimum requirement: Release 43.500.000

Information
Scope definition
Scope 1: Over-the-Air (OTA) software update via PCM.
•

Please note that the OTA software updates should generally be installed by the driver (main user) via the
Porsche Communication Management (PCM), provided that the software package for the campaign has
been downloaded to the vehicle via OTA (Scope 1) and the update is subsequently displayed in the PCM
"Updates" menu.

•

For required preconditions for performing the OTA software update, see ⇒ Technical Information
'Preconditions for the OTA software update via PCM'

•

Only vehicles, for which the high-voltage battery was checked via the evaluation of the vehicle analysis
log (VAL) within the last 40 days and no abnormalities were detected, were assigned to the OTA scope.

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Technical Information

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ARB7

Scope 2: Automatically re-program the control unit for high-voltage battery (BMCe) using the PIWIS tester.
Information
Please note:
The vehicles affected by this action are additionally assigned to the workshop/OTA campaign WRW1 if
necessary.
If this is the case, the present workshop campaign ARB7 must absolutely be carried out first and only then
the control unit programming started as part of the WRW1 campaign.
Affected
Vehicles:

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

Required tools
Tools:

•
•

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
P90999 - PIWIS Tester 4 with installed test software version 43.500.000

Automatically re-programming the high-voltage battery control unit (BMCe)
Work Procedure: 1

Re-program high-voltage battery control unit (BMCe).
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 the table below.
Required PIWIS Tester software release:

43.500.000 (or higher)

Type of control unit programming:

Control unit programming using the 'A utomatic
programming' function of the high-voltage battery
control unit:
'High-voltage battery (BMCe)' control unit –
'Coding / Programming' menu – 'A utomatic
programming' function.
Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.

Programming sequence:

Do not interrupt the programming and coding
process.
A backup documentation process for the
re-programmed software releases starts as soon
as programming and coding is complete.
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Service

Technical Information

198/24 ENU

ARB7

2

Programming time (approx.):

10 minutes

Software release programmed during this
campaign:

1606 or 1651 or 1652
The programmed software status depends on the
cell chemistry or battery generation.
Following control unit programming, the software
release can be selected from the relevant control
unit in the 'Extended identifications' menu using
the PIWIS Tester.

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

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

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

•
•

•

2

Terminate and restore readiness for operation
(switch ignition off and then switch on again).
Read out and erase the fault memory ⇒
Workshop Manual '9X00IN Basic instructions
and procedure for control unit programming
using the PIWIS Tester'.
Repeat control unit programming by
restarting programming.

Read out all fault memories, process existing faults if necessary and delete fault memory.
Information
If control units have faults that are not caused by control unit programming, these must first be located
and corrected. This work cannot be invoiced under the workshop campaign number.

3

Press •F3“ to start the integration test in the control unit selection.
All affected control units should now be successfully re-programmed or checked in the control unit and
the overview of the control units and their status.
Information
If a deviation in the integration test is still indicated despite programming carried out, this must be
repeated. If the deviation persists, contact Technical Support.

4

Enter the campaign in the Warranty and Maintenance Logbook.

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Technical Information

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ARB7

Warranty processing
Scope 1:

Re-programming Over-the-Air (OTA) software update via PCM – high-voltage battery control unit (BMCe)
•

Scope 2:

No invoicing possible.

Automatically re-programming control unit for high-voltage battery (BMCe) using the PIWIS tester
Labor time:
Labor time: 60 TU

Re-programming high-voltage battery control unit (BMCe)
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Reading out software release of the control unit
Reading out and deleting fault memory
Þ Damage code ARB7 099 000 1
⇒

Preconditions for OTA software update via PCM
Preconditions:

General preconditions for OTA software updates
•
•

The respective customer has an active Porsche Connect Care package
Consent to online software updates was not withdrawn in the MyPorsche app

Preconditions for performing an OTA software update
•
•
•
•
•
•
•
•
•
•

Driver (main user) logged into Porsche Communication Management (PCM)
Privacy Mode in Porsche Communication Management (PCM) deactivated
Vehicle safely parked and on flat ground
P button next to selector lever (parking mode) pressed and parking brake activated
Power button pressed with driver door closed, to stop driving readiness
Parking pre-climatization deactivated
All doors and windows, front and rear lids and sliding roof closed
Charging process completed, charging cable disconnected and charging connection lid closed
All passengers have left the vehicle
Vehicle locked from outside via handheld transmitter

After the driver has started the OTA software update via Porsche Communication Management (PCM), the
preconditions listed above are also displayed in the central display.
Once all the preconditions have been met and the vehicle has been locked from the outside, the OTA software
update starts automatically.
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.

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