No. 36-21-1

Service
Technical Information
36/21
ENU
2797
2
Complaint – Charging is Canceled / Check Engine Warning Light is Active: Re-Program
High-Voltage Charger (OBC) Control Unit (36/21)
Revision:
This bulletin replaces bulletin Group 2 36/21, dated March 19, 2021.
Model Year:
As of 2017
Vehicle Type:
Cayenne E-Hybrid (9YA / 9YB)
Concerns:
High-voltage charger (OBC) control unit (3.6 kW)
Information:
Charging of the high-voltage battery is cancelled and the Check Engine warning light comes on in the
instrument cluster. In many cases, it may be possible to continue charging the vehicle once the vehicle
plug has been disconnected and then re-connected to the vehicle.
This fault is caused by voltage fluctuations in the supply network (e.g. the domestic connection) to which
the high-voltage battery charger is connected.
The entry 'B200000 – Control unit, function restriction (E10105)' is stored in the fault memory
of the high-voltage charger (OBC) control unit as an active fault memory entry, which cannot be deleted
initially. As a result, the Check Engine warning light is not deactivated.
Action required: In the event of a customer complaint, re-program the high-voltage charger (OBC) control unit using the
relevant programming code.
Information
•
Control unit programming sets the fault memory entry 'B200000 – Control unit, function restriction
(E10105)' to passive, which can then be deleted.
•
We are currently working on a software solution that permanently corrects the fault type described
here. As soon as it becomes available, this Technical Information (TI) will be updated accordingly.
•
Replacing the control unit will not correct the problem because the parts that are currently available
use the same software as the control unit that was the object of the complaint.
Information
Please inform the customer that until such a time as the software is updated, we cannot rule out the possibility that the fault will occur again on the same charging connection as before.
Remind the customer to use another charge connection until further notice, if possible.
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Required tools
Information
The Cayenne is equipped as standard with a lithium starter battery, which must only be charged using
suitable battery chargers.
For further information about the battery chargers to be used, see:
Tools:
•
 Workshop Manual '2706IN General information on the 12-volt lithium-ion battery'
•
 Workshop Manual '270689 Charging vehicle electrical system battery'
•
Battery charger with a current rating of at least 90 A and - if required - also with a current and
voltage-controlled charge map for lithium starter batteries, e.g. VAS 5908 Battery charger,
90 A
9900 - PIWIS Tester 3 with PIWIS Tester software version 39.900.100 (or higher) installed
•
Preparatory work
WARNING
Electrically moved side windows and rear spoiler
•
Danger of limbs being trapped or severed
•
Risk of damage to components

Do not reach into the danger area.

Keep third parties away from the danger area.

Do not move components or tools into the danger area.

Retract roll-up sun blinds on the rear side windows before starting programming or coding.
NOTICE
Fault entry in the fault memory and control unit programming aborted due to undervoltage.
•
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.

Before getting started, connect a suitable battery charger with a current rating of at least 90 A to the
jump-start terminals in the engine compartment.
NOTICE
Control unit programming will be aborted if the WiFi connection is unstable.
•
An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.
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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 vehicle key is not recognized.
•
If the driver's key is not recognized in the vehicle, programming cannot be started or will be interrupted.

Place the driver's key with the back facing down into the front left storage compartment in the center
console to guarantee a continuous radio link between the vehicle and the driver's key.
Work Procedure: 1
Position the driver's key in the rear area of the left
cupholder in the center console between the holding
struts (emergency start tray) in order to guarantee a
permanent radio link between the vehicle and driver's
key Emergency start tray.
2
Carry out general preliminary work for control unit
programming as described in  Workshop Manual
'9X00IN Basic instructions and procedure for control
unit programming - section on "Preliminary work"'.
Emergency start tray
Re-programming high-voltage charger (OBC) control unit
Information
The total time required for control unit programming is approx. 4 minutes.
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 - section
on "Programming"'.
Specific information on control unit programming in the context of this Technical Information:
Required PIWIS Tester software version:
39.900.100 (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.
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Programming code:
E3K4S
Programming sequence:
Read and follow the information and instructions
on the PIWIS Tester during the guided programming
sequence.
During programming, the high-voltage charger (OBC)
control unit is re-programmed and then re-coded
automatically.
Do not interrupt programming.
Programming time (approx.):
4 minutes
Software version programmed during this
campaign:
6119
•
The software version information in the
programmed data record is based on the
specified PIWIS Tester software version.
Please note that these may have changed in
a higher version.
•
Procedure in the event of error messages
appearing during the programming
sequence:
 Workshop Manual '9X00IN Basic instructions and
procedure for control unit programming - section on
"Fault finding"'.
Procedure in the event of abnormal termination of control unit programming:
Repeat control unit programming by restarting
programming.
2
Read out and erase the fault memory.
2.1
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For the vehicles subject to a complaint, the
software version does not change because only
the old application software (version 6119) is
re-installed. The measure must therefore be
carried out even if software version 6119 was
already read out in advance using the PIWIS
Tester.
Following control unit programming, the software
version can be read out of the high-voltage
charger (OBC) control unit from the menu 
'Extended identifications' using the PIWIS Tester.
Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.
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Select the function 'Read all fault memories
and erase if required' and press •F12“
('Next') to confirm your selection  Erasing
fault memories.
The fault memories of the control units are
read out.
2.3
Once you have read out the fault memories,
check the fault memory entries.
Erasing fault memories
Information
If control units are found to have faults that
are not caused by control unit programming, these must first be found and corrected.
2.4
Press •F8“ to delete fault memory entries.
2.5
Press •F12“ ('Yes') in response to the question asking whether you really want to delete all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
2.6
Once you have erased the fault memories,
select the 'Overview' menu to return to the
control unit selection screen  Control unit
selection.
Control unit selection
Concluding work
Work Procedure: 1
Carry out general subsequent work for control unit programming as described in  Workshop
Manual '9X00IN Basic instructions and procedure for control unit programming using the PIWIS
Tester - section on "Subsequent work"'.
Invoicing
Invoicing:
For documentation and warranty invoicing, enter the labor operations and PQIS coding specified below in
the warranty claim:
APOS
Labor operation
27972590
Programming the high-voltage charger
I No.
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PQIS coding:
Location (FES5)
27970
High-voltage charger
Damage type (SA4)
1612
does not function at times
References:
 Workshop Manual '2706IN General information on the 12-volt lithium-ion battery'
 Workshop Manual '270689 Charging battery/vehicle electrical system'
 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.
© 2021 Porsche Cars North America, Inc.
Sep 3, 2021
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