No. 104-21 Service Bulletin/Repair Instructions

Service
Technical Information
104/21 ENU
9025
9
Complaint – Average Consumption Value Display Resets Automatically: Re-Programming

Instrument Cluster Control Unit (104/21)

Model Line:
Taycan (Y1A)
Model Year:
As of 2020 up to 2021
Concerns:
Instrument cluster control unit
Information:
The customer complains that the average consumption value display resets to 0.0 mi/kWh after a vehicle

mileage of 74.1 miles.

This may be caused by defective software in the instrument cluster.
Action required: In the event of a customer complaint, re-program the instrument cluster control unit using the relevant

programming code.

Information

The total time required for control unit programming is approx. 15 minutes.
Required tools

Information

The Taycan 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:
 Workshop Manual '2706IN General information on the 12-volt lithium-ion battery'

 Workshop Manual '270689 Charging battery/vehicle electrical system'

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

9900 - PIWIS Tester 3 with PIWIS Tester software version 40.200.010 (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
AfterSales
Sep 3, 2021

Page 1 of 5
9
Service
Technical Information
ENU 104/21
9025

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 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 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.

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 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.
Work Procedure: 1
Place the driver's key with the back facing down

into the front left storage compartment in the center

console (emergency start tray) to guarantee a

continuous radio link between the vehicle and the

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
Sep 3, 2021

Page 2 of 5
AfterSales
Service
Technical Information
104/21 ENU
9025
9
Re-programming instrument cluster 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 and coding.

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:
Information

The following initial software version of the instrument cluster control unit is required for the control unit

programming described here: 0595.

For the source software, open programming campaigns may be necessary.

Required PIWIS Tester software version:
40.200.010 (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:
B4L6T
Programming sequence:
Read and follow the information and instructions

on the PIWIS Tester during the guided programming

sequence.

During the programming sequence, the instrument

cluster control unit is re-programmed and then automatically re-coded.

Do not interrupt programming.
Programming time (approx.):
15 minutes
AfterSales
Sep 3, 2021

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9
Service
Technical Information
ENU 104/21
9025
Software version for the instrument

cluster control unit programmed during

programming:

The software version information in the

programmed data record is based on the

specified PIWIS Tester software version.

Please note that this may have changed in a

higher software version.
0598

Following control unit programming, the software

version can be read out of the instrument cluster

control unit in the  'Extended identifications' menu

using the PIWIS Tester.
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
Commission component protection.

For instructions, see:

 Workshop Manual '903555 Replacing Gateway control unit'
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
90252590
Programming instrument clusters
I No.
PQIS coding:

Location (FES5)
90250
Instrument cluster
Damage type (SA4)
1614
Function not as specified
References:
 Technical Information '9X00IN WMA5 Workshop campaign - Updating software for various control

units'
Sep 3, 2021

Page 4 of 5
AfterSales
Service
Technical Information
104/21 ENU
9025
9
 Technical Information '9X00IN WMA6 Workshop campaign - Updating software for various control

units'
 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.
AfterSales
Sep 3, 2021

Page 5 of 5

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