No. 144-21

Service
Technical Information
144/21 ENU
4770
4
"Chassis Fault" Warning/Fault Memory Entry "C059500" in the Brake Booster Control Unit
(144/21)
Vehicle Type:
Panamera 4 E-Hybrid (971)/Panamera 4S E-Hybrid (971)/Panamera Turbo S E-Hybrid (971)
Model Year:
As of 2017 up to 2021
Concerns:
Brake booster control unit
Information:
•
•
The yellow warning 'Chassis fault – Adapted driving permitted' is displayed in the instrument
cluster. The warning message sometimes appears together with a noticeably stiffer and slightly
vibrating brake pedal.
The fault memory entry 'C059500 – Brake booster control unit – power level implausible
(00E900)' is stored in the fault memory of the brake booster control unit. This is caused by a
temporary (individual) or permanent internal overcurrent detected in the brake booster control unit.
Action required: In the event of a customer complaint, re-code the brake booster control unit using PIWIS Tester software
version 40.550.022 (or higher).
Required tools
Tools:
•
•
9900 - PIWIS Tester 3 with PIWIS Tester software version 40.550.022 (or higher) installed
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
For further information about the battery chargers to be used, see  Workshop Manual '270689
Charging vehicle electrical system battery'.
Preparatory work
NOTICE
Fault entry in the fault memory and/or control unit coding aborted due to undervoltage.
•
Increased current draw during diagnosis or control unit coding can cause a drop in voltage, which can
result in one or more fault entries and the abnormal termination of the coding process.

Before starting control unit coding, connect a suitable battery charger with a current rating of at least 90 A
to the vehicle.
NOTICE
Coding will be aborted if the WiFi connection is unstable.
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Technical Information
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•
An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, coding may be aborted.

During control unit coding, always connect the PIWIS Tester to the vehicle communication module (VCI) via
the USB cable.
NOTICE
Control unit coding will be aborted if the driver's key is not recognized
•
If the driver's key is not recognized in the vehicle, coding cannot be started or will be interrupted.

Place the driver's key with the back facing down in the area in front of the storage compartment under
the armrest (emergency start tray) in order to guarantee a permanent radio link between the vehicle and
driver's key.
Work Procedure: 1
Connect a suitable battery charger with a current rating of at least 90 A, e.g. Battery charger
90A, to the jump-start terminals in the luggage compartment and switch it on.  Workshop Manual
'270689 Charging vehicle electrical system battery'
2
Place driver's key in emergency start tray.
3
Connect 9900 - PIWIS Tester 3 to the vehicle
communication module (VCI) via the USB cable.
Then connect the communication module to the
vehicle and switch on the PIWIS Tester.
4
Switch on the ignition.
5
On the PIWIS Tester start screen, call up the 'Diagnostics' application.
The vehicle type is then read out, the diagnostic application is started and the control unit selection screen
is populated.
Emergency start tray
Re-coding brake booster control unit
NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version.
•
Measure is ineffective

Always use the specified version or a higher version of the PIWIS Tester software for control unit coding.
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Service
Technical Information
144/21 ENU
4770
4
Information
The procedure described here is based on the PIWIS Tester 3 software version 40.550.022.
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.
Work Procedure: 1
Re-code brake booster control unit automatically.
Required PIWIS software version:
40.550.022 (or higher)
Type of control unit coding:
Control unit coding using the 'Automatic coding'
function for the brake booster control unit:
'Brake booster' control unit –
'Coding/programming' menu – 'Automatic
coding' function.
Read and follow the information and instructions
on the PIWIS Tester during the guided procedure.
Coding sequence:
Do not interrupt coding.
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.
Concluding work
Work Procedure: 1
Read out the fault memory and check any existing fault memory entries.
Information
If control units are found to have faults that are not caused by the fault described here, these must be
found and corrected.
2
Delete the fault memory.
3
Switch off ignition.
4
Disconnect 9900 - PIWIS Tester 3 from the vehicle.
5
Remove the driver's key from the emergency start tray.
6
Disconnect the battery charger.
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Invoicing
For documentation and warranty invoicing, enter the labor operation and PQIS coding specified below in
the warranty claim:
APOS
Labor operation
47702515
Programming brake booster
I No.
PQIS coding:
Location (FES5)
47700
Brake booster
Damage type (SA4)
1614
Function not as specified
References:
 Workshop Manual '270689 Charging vehicle electrical system battery'
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.
Oct 22, 2021
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