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Replacement Requirement for 37 Ah High-Voltage Battery Cell Module on Vehicles up to
Model Year 2020 (L): Re-Programming High-Voltage Battery Control Unit (BMC) (63/24)
Vehicle Type:

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

Model Year:

As of 2019 up to 2020

Concerns:

Replacement requirement for high-voltage battery cell module

Cause:

If cell modules of the high-voltage battery need to be replaced, the only cell modules available
for the aforementioned vehicles will be those also used in the vehicles of model year 2021 (M)
and later as standard.
In order to be able to use the modified cell modules on the vehicles mentioned above in a mixed installation with the previous cell modules, software release 0278 must be available on the control unit for the
high-voltage battery (BMC).

Overview of
high-voltage
battery cell
modules:

Part No. old
(no longer available)

Designation

PAB915591

 High-voltage battery module (37Ah)

or
PAB915591A

 High-voltage battery module (37Ah)

Part No. new*

Designation

PAB915591H

 High-voltage battery module (37Ah)

or
PAB915591J

 High-voltage battery module (37Ah)

* can only be used in vehicles up to model year 2020 (L) in conjunction with software release 0278 in the
high-voltage battery control unit (BMC).
Action:

After installing the modified cell modules for the high-voltage battery, check the current software version
in the high-voltage battery control unit (BMC) and, if necessary, program it to software version 0278 in
accordance with the following description.

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Information
The minimum programming requirement is the PIWIS Tester software release: 42.600.020

Information
In addition to the high-voltage battery control unit (BMC), the high-voltage E-box (BJB) and cell
modules 1-8 (CMC) are also re-programmed and then re-coded automatically.
The total duration of just the Programming and coding of all control units is approx. 50 minutes.

Required tools for control unit programming
Tools:

•
•

P90999 - PIWIS Tester 4 with PIWIS Tester test software release 42.600.020 (or higher) installed
Battery charger with a current rating of at least 90 A, e.g. VAS 5908 90 A battery charger. For
further information about the battery chargers to be used, see the corresponding Workshop Manual.
 Workshop Manual '270689 Charging battery and vehicle electrical system'

Re-programming high-voltage battery control unit (BMC)
Work Procedure: 1

The basic procedure for programming a control unit is described in the Workshop Manual 
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester - section on “Programming”'.
For specific information on control unit programming during this campaign, see the table
below.

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Required PIWIS Tester software release:

42.600.020 (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:

A3D8P

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Read and follow the information and
instructions on the PIWIS Tester during the
guided programming sequence.

Programming sequence:

Do not interrupt programming and coding
process.
A backup documentation process for the
re-programmed software releases starts as
soon as programming and coding is complete.
Programming time (approx.):

50 minutes

Software release programmed during this
campaign:

•

High-voltage battery control unit (BMC):
0278

•
•

Cell module 1-8 (CMC): 0108/0808
High-voltage E-box (BJB): 0134

Following control unit programming, the
software release can be read out from the
relevant control unit using the PIWIS Tester in
the menu  “Incremented identifications”.

2

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

 Workshop Manual '9X00IN Basic instructions

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

Repeat control unit programming by restarting
programming.

and procedure for control unit programming
using the PIWIS Tester - section on “Troubleshooting”'.

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

Exit the diagnostic application, switch off the ignition, disconnect the PIWIS tester from the vehicle.

4

Switch off and disconnect the battery charger.

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Labor position and PCSS encryption
Labor position:
I No.

APOS

Labor operation

27080190

Checking high-voltage battery control unit

27942590

Checking and programming high-voltage battery
control unit
PCSS encryption:

Location (FES5)

27080

High-voltage battery

Damage type (SA4)

9744

Part not available

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.

© 2024 Porsche Cars North America, Inc.

May 23, 2024
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