Service

Technical Information

04/26 ENU

9110

9

Time and Date Display Not Up-to-Date/Available After the 12-Volt Vehicle Electrical System Battery
has been Disconnected for a Long Time (04/26)
Model Line:

Cayman/Boxster (981)
911 (991)
Panamera (970)
Macan (95B)
Cayenne (92A)

Model Year:

As of 2010 up to 2016

Concerns:

Front display/control panel (PCM 3.1)

Cause:

The customer complains that the time and date display is not up-to-date/available after the vehicle has
been parked for a long time without a connected or discharged vehicle electrical system battery.

Information:

On vehicles with Porsche Communication Management (PCM 3.1), the date and time are automatically
synchronized via satellite navigation signals (GPS).
The time and date displays are not set manually on these vehicles.
Information
Component replacement will not work in the case of this fault pattern.

Action:

In the event of a customer complaint, proceed as follows:
1

Change vehicle order temporarily to control number “7Q0”. (Note original value)

2

Set the time and date display manually on the instrument cluster.

3

Reset control number to original value.

•
•

P90999 - Porsche Tester 4
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., battery charger 90 A. For further information about the battery
chargers to be used, see the corresponding Workshop Manual. ⇒ Workshop Manual '270689 Charging
the vehicle electrical system battery'

Required tools
Tools:

AfterSales

Mar 10, 2026
Page 1 of 4

9

Service
9110

ENU

Technical Information

04/26

Setting time and date display manually
Information
The previous original value of the PR number family “Navigation PCM” must be noted and re-installed after
setting the time and date display.
Work Procedure: 1

Connect and switch on the battery charger.

⇒ Workshop Manual '270689A4 Charge battery and vehicle electrical system'

2

Connect P90999 - Porsche Tester 4, switch on the ignition and start the diagnostic application.

3

Change vehicle order temporarily to control number “7Q0”.
Information
The vehicle data is maintained via a guided Tester procedure.
Pay particular attention to the following:

Mar 10, 2026
Page 2 of 4

•

A connection to the Internet is required for the Tester procedure.

•

Depending on the changes made to the vehicle data, automatic coding and backup documentation
of the affected control units is performed after saving these changes.

•

Read and follow the information and instructions on the Porsche Tester during the guided
procedure.

•

Do not interrupt the coding process. When coding is complete, the message ''Coding has been
completed successfully'' is displayed and a tick will then appear in the 'Status' box.

3.1

In the control unit selection (‘Overview’ menu) press •F7“ to call up the Additional menu.

3.2

Select the 'Vehicle data maintenance with Porsche-ONLINE' function and press •F12“ ('Next')
to confirm.

3.3

Press •F12“ (‘Next’) to skip the displays containing information about vehicle description,
colours / materials and X numbers.

3.4

On the second page of the M numbers, write down the original value of the PR number family
“Navigation PCM”.

3.5

Set coding value “7Q0” to the vehicle data. To do this, select the corresponding coding value via
the drop-down menu in the “PR number family”.
The original value is replaced by the coding value “7Q0”.
Make sure that the ‘Installed’ column is ticked and that the pen symbol is displayed in the
‘Changed’ column.
Then press •F12“ (‘Next’) to close the PR numbers display.

3.6

Press •F8“ in the overview that is then displayed to save the changed vehicle data.

3.7

Once you have saved the vehicle data, press •F11“ (‘Back’) to return to the control unit
selection screen.

AfterSales

Service

Technical Information
4

04/26 ENU

9110

9

Re-code instrument cluster control unit.
The basic procedure to follow for control unit coding is described in the Workshop Manual.

⇒ Workshop Manual '270689A4 Basic instructions and procedure for control unit programming using

the PIWIS Tester'

Required Porsche Tester software release:

43.800.040 (or higher)

Type of control unit coding:

Control unit coding using the 'A utomatic coding'
function for the control unit:
Control unit ‘Instrument cluster’ – menu
‘Coding/programming’ – function ‘Automatic coding’.

Coding sequence:

Read and follow the information and instructions on
the Porsche Tester during the guided procedure.
Do not interrupt the coding process.
When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the 'Status' box.

Procedure if control unit coding is not
successful:

Repeat control unit coding.

5

Set the time and date display manually on the instrument cluster.
For work procedure, see: ⇒ Vehicle Driver’s Manual - section: “Instrument panel and multi-function
display”

6

Reset vehicle data to original value.
6.1

In the control unit selection (‘Overview’ menu) press •F7“ to call up the Additional menu.

6.2

Select the 'Vehicle data maintenance with Porsche-ONLINE' function and press •F12“ ('Next')
to confirm.

6.3

Press •F12“ (“Next”) to skip the displays containing information about vehicle description,
colours / materials and X numbers.

6.4

On the second page of the M numbers, set the original value of the PR number family
“Navigation PCM” to the vehicle data as noted in Step 3.4. To do this, select the corresponding
coding value via the drop-down menu in the “PR number family”.
The coding value “7Q0” is replaced by the original value.
Make sure that the ‘Installed’ column is ticked and that the pen symbol is displayed in the
‘Changed’ column.
Then press •F12“ (‘Next’) to close the PR numbers display.

6.5

Press •F8“ in the overview that is then displayed to save the changed vehicle data.

6.6

Once you have saved the vehicle data, press •F11“ ('Back') to return to the control unit
selection screen.

AfterSales

Mar 10, 2026
Page 3 of 4

9

Service
9110

ENU

7

Technical Information

04/26

Re-code instrument cluster control unit again.
Type of control unit coding:

Control unit coding using the 'A utomatic coding'
function for the control unit:
Control unit ‘Instrument cluster’ – menu
‘Coding/programming’ – function ‘Automatic coding’.

Coding sequence:

Read and follow the information and instructions on
the Porsche Tester during the guided procedure.
Do not interrupt the coding process.
When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the 'Status' box.

Procedure if control unit coding is not
successful:

Repeat control unit coding.

8

Read out and delete all control unit fault memories.

9

Exit the diagnostic application, switch off the ignition and disconnect P90999 - Porsche Tester 4 from
the vehicle.

10 Switch off and disconnect the battery charger.
⇒ Workshop Manual '270689 Charging the vehicle electrical system battery'
End of action.

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.

© 2026 Porsche Cars North America, Inc.

Mar 10, 2026
Page 4 of 4

AfterSales