Service

Technical Information

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WLA0 - Re-programming DME control unit (Workshop 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:

2018

Vehicle type:

Panamera 4 E-Hybrid (971)
Panamera 4 E-Hybrid Executive (971)
Panamera 4 E-Hybrid Sport Turismo (971)

Country/market:

USA (C02)
Canada (C36)

Subject:

DME control unit

Information:

When converting the engine power specification from kilowatts to horsepower for the affected
vehicles, the conversion factor for the European unit (hp) was used instead of the unit that is
normally used in the affected markets, SAE net horsepower (SAE hp).
As a result, the engine power specification is on average approx. 1.4% higher than the actual engine
power.

Remedial
Action:

Re-program the DME control unit using the PIWIS Tester with test software version 39.200.010 or a
higher software version installed.
Information
With the updated data record for the DME control unit, the maximum engine power is increased by a slight
adjustment to the boost pressure to the factory specification.
This adaptation does not affect the fuel consumption values, emissions or durability of the engine.

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Information
When the DME control unit is programmed, the PDK control unit is also re-programmed automatically.
It takes approx. 15 minutes in total to program the control units.
Before starting programming and after the control units have been programmed successfully, the
procedure for sending backup documentation of the software versions installed on the control units to
the Porsche After Sales systems will be started automatically.
Affected
Vehicles:

Only vehicles assigned to the campaign (see also PCSS Vehicle Information). This campaign affects
39,396 vehicles in North America.

Required tools
Tools:

•
•

9900 - PIWIS Tester 3 with PIWIS Tester software version 39.200.010 (or higher) installed
Battery charger with a current rating of at least 90 A, e.g. 90 Amp Charger e.g. VAS 5908

Preparatory work
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low-voltage.
•

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 starting control unit programming, connect a suitable battery charger with a current rating of at
least 90 A to the vehicle.
NOTICE

Control unit programming will be aborted if the Internet connection is unstable.
•

An unstable Internet connection can interrupt communication between PIWIS Tester and the vehicle
communication module (VCI). As a result, control unit programming may be aborted.



During control unit programming, always connect PIWIS Tester to the vehicle communication module (VCI)
via the USB cable.
NOTICE

Control unit programming will be aborted if the driver's 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.

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AfterSales

Service

Technical Information

Work Procedure: 1

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Connect a battery charger with a current rating of
at least 90 A, e.g. 90 Amp Charger e.g. VAS
5908, to the jump-start terminals in the engine
compartment and switch it on  Jump-start
terminals.

Jump-start terminals
2

Place the driver's key with the back facing down in the
front left storage compartment in the center console
 Driver's key in storage compartment. This will
guarantee an uninterrupted radio link between the
vehicle and the driver's key.

3

Connect the PIWIS Tester to the vehicle communication module (VCI) via the USB cable. Then connect
the communication module to the vehicle and switch
on the PIWIS Tester.

Driver's key in storage compartment

4

Switch on the ignition.

5

On the PIWIS Tester start screen, call up the 'Diagnostics' menu. The vehicle type is then read out,
the diagnostic application is started and the control unit selection screen is populated.

Re-programming DME control unit
NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version
•

Measure is ineffective



Always use the prescribed version or a higher version of the PIWIS Tester software for control unit
programming or coding.

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Information
The procedure described here is based on the PIWIS Tester 3 test software version 39.200.010.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed.
A discrepancy may arise with later software versions for example.
It is imperative that the PIWIS Tester remains online during control unit programming so that backup documentation of the software versions installed on the control units before and after programming is sent
to the Porsche After Sales systems.
Work Procedure: 1

Re-program DME control unit.
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 version:

39.200.010 (or higher)

Type of control unit programming:

Control unit programming using the 'Automatic
programming' function for the DME control unit:
'DME' control unit – 'Coding/programming' menu
– 'Automatic programming' function.
Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During the programming sequence, the DME
control unit is re-programmed first, then the PDK
control unit is re-programmed.

Programming sequence:

Both control units are then re-codedautomatically.
Do not interrupt programming and coding.
Once the control units have been programmed and
coded, you will be prompted to switch the ignition off
and then back on again after a certain waiting time.
Backup documentation of the new software versions
is then performed.
The programming sequence takes
(approx.):

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15 minutes

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Software version programmed during this
campaign:

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DME software version: 0003
DME software part number: 972907551R
Following control unit programming, the software
part number and version of the programmed data
record can be read out of the DME control unit in the
 'Extended identification' menu using the PIWIS
Tester.

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

• Switch ignition off and then on again.
• Read out and erase fault memories  Workshop
Manual '9X00IN Basic instructions and procedure
for control unit programming using the PIWIS Tester section on "Subsequent work"'.
• Repeat control unit programming by restarting
programming.

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

 Workshop Manual '9X00IN Basic instructions and
procedure for control unit programming using the
PIWIS Tester - section on "Fault finding"'.

Concluding work
Work
Procedure:

Information
Brief breaks in communication between the control units during programming and coding can result in
fault memory entries in all control units in the vehicle system, which might not be deleted automatically.
In addition to the automatic deletion of the fault memories during programming, the fault memories
of all control units must therefore be read out and deleted again as described below after each
programming and coding process.
1

Read out and erase the fault memories of all control units.
1.1

Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.

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1.2

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.

1.3

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. This
work cannot be invoiced under the workshop campaign number.

1.4

Press •F8“ to delete fault memory entries.

1.5

Press •F12“ ('Yes') in response to the question as to whether you really want to delete all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If fault memory entries for individual control units cannot be deleted, proceed as follows:

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•

Switch off the ignition.

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key.

•

Wait approx. 1 minute before unlocking the vehicle again.

•

Start the engine, leave it running for a short time and then stop it again.

•

Switch off the ignition and wait approx. 10 seconds before switching it back on again.

•

Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore
communication with the vehicle.

•

Read out the fault memory again and delete any fault memory entries that are stored.

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Once you have erased the fault memories,
select the 'Overview' menu to return to the
control unit selection screen  Control unit
selection.

2

Switch off the ignition.

3

Disconnect the PIWIS Tester from the vehicle.

4

Switch off and disconnect the battery charger.

5

Enter the campaign in the Warranty and Maintenance
booklet.

Control unit selection

Warranty processing
Scope 1:

Not relevant for this vehicle type.

Scope 2:

Re-program DME control unit
•
•
•

Panamera 4 E-Hybrid (971)
Panamera 4 E-Hybrid Executive (971)
Panamera 4 E-Hybrid Sport Turismo (971)
Working time:
Re-programming DME control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester
Re-programming PDK control unit
Performing backup documentation before and after
programming
Reading out and erasing fault memory

Labor time: 61 TU

 Damage Code WLA0 66 000 1

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.

© 2020 Porsche Cars North America, Inc.

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