NHTSA ID Number: 11021388
Manufacturer Communication Number: No. 65-23
TSB/Document Date: 2025-08-05
Summary
Technical information for Various Fault Patterns for Porsche
Communication Management (PCM) With Software Version 37xx / 38xx: Performing Software Update
Service
Technical Information
65/23
ENU
9152
9
Various Fault Patterns for Porsche Communication Management (PCM) With Software Version 37xx /
38xx: Performing Software Update (65/23)
Modifications overview
Release
Date
Modification
0
03/12/2025
•
First publication
1
07/10/2025
•
•
•
Heading adapted
Possible error patterns added
PIWIS Tester software release adapted
Model Line:
Taycan (Y1A / Y1B / Y1C)
Model Year:
As of 2020 up to 2024
Concerns:
Control unit for central computer (PCM)
Cause:
The PCM cannot be switched on, fails intermittently during vehicle operation or starts up again independently.
Possible features:
•
•
•
•
PCM screen shows a blue charging ring (loading spinner)
PCM screen shows the "PORSCHE" logo permanently during an ignition cycle
PCM screen remains black
The PCM can be started again after some time or upon ignition change or it starts up again on its own
No access to the vehicle via the MyPorsche app with the message ‘Vehicle in private mode’ although the
vehicle is not in private mode.
Action:
In the event of a complaint, re-program the central computer (PCM) with the latest PIWIS Tester software
release.
Information
The minimum programming requirement is the PIWIS Tester software release 43.400.040.
Information
For the topics "loading spinner" and "PORSCHE logo", the software update significantly reduces the probability of a new error.
AfterSales
Jul 10, 2025
Page 1 of 6
9
Service
9152
ENU
Technical Information
65/23
Required tools
Tools:
•
•
•
P90999 - PIWIS Tester 4
Battery charger with a current rating of at least 90 A, e.g. VAS 5908 - battery charger 90 A
USB storage medium Type A+C 32 GB (for PCM update), Part-No. V04014999WW000, already
available at the Porsche Center
Overview of PCM update
Information
The central computer (PCM) software update is performed using a USB storage medium. The software
release that is specific to each region must be downloaded using the software tool PiUS (Porsche integrated
Update Service) and must be installed on a blank USB storage medium.
Pay particular attention to the following:
•
For this PCM software update, a USB storage medium must be used.
•
To use the software tool, one blank or re-writable USB storage medium is required for each individual
software.
•
The software available in PiUS must only be used in accordance with the instructions provided in a
Technical Information published for this purpose.
The software listed here may only be used for the action described here. Damage to the central computer
cannot be ruled out if the software is used on other vehicles.
You will find further information on installation and use for the PiUS software tool in the PPN portal under
*PiUS (Porsche integrated Update Service) goes live*.
Overview:
Jul 10, 2025
Page 2 of 6
Part No.
Designation
– Region
Vehicle allocation
9Y2909000AF
USB storage medium for PCM
update
– North America
I-No. ER3 / ER4
AfterSales
Service
Technical Information
65/23
ENU
9152
9
Re-programming control unit for central computer (PCM)
Information
Before starting programming, particular attention must be paid to the following:
•
Switch the charger off and on once; the battery charger display must be off before starting it again,
because the battery charger automatically switches to trickle charge after 5 hours (default setting in
the charger).
•
The charger must be set to 14.8 V charging voltage and operated in charging mode.
•
Vehicles with a PVTS contract must have Workshop mode activated.
•
The PIWIS Tester must not be charged using the cigarette lighter!
Work Procedure: 1
Unless otherwise already done, prepare USB storage medium with the software required for the PCM
central computer depending on the country variant in accordance with the above overview.
⇒ Technical Information 'Overview of PCM update'
2
The basic procedure for control unit programming is described in the Workshop Manual ⇒ Workshop
Manual 'Basic Instructions and Procedure for Control Unit Programming Using the PIWIS Tester'.
3
Select Guest account from the central display (PCM) and activate Privacy mode (available in some
countries).
Information
If Privacy mode is not active, programming may be aborted, resulting in a defect in the central computer
(PCM).
4
Re-program central computer (PCM).
For specific information on control unit programming during this campaign, see the table below.
Required PIWIS Tester software release:
43.400.040 (or higher)
Type of control unit programming:
PCM central computer update using PIWIS Tester
start code to start the guided programming
sequence. The PCM application software is loaded
via USB storage medium.
In the control unit selection (‘Overview’ menu)
select the PCM central computer control unit and
select the ‘Service / repairs’ menu.
Select the ‘Install software update’ function and
press •F12“ (‘Next’) to perform the software
update.
Programming code:
X6H2L
AfterSales
Jul 10, 2025
Page 3 of 6
9
Service
9152
ENU
Technical Information
65/23
Programming sequence:
Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
Do not interrupt programming and coding.
A backup documentation process for the
re-programmed software versions starts once
programming and coding is complete.
Required software (part number and software
version):
•
North America (M-No. ER3/ER4):
9Y2909000AF / 3885
Programming time (up to):
25 minutes
Procedure in the event of error messages
appearing during the programming sequence:
⇒ Workshop Manual '9X00IN Basic instructions
and procedure for control unit programming using
the PIWIS Tester - Section on “Troubleshooting”'
Procedure in the event of a termination in the
control unit programming:
Repeat control unit programming by restarting
programming.
Additional instructions for aborted programming
⇒ Technical Information '9X00IN Additional
instructions on aborted programming'
Integration test procedure:
•
The integration test shows a green result
regardless of this update
5
Remove USB storage medium.
6
Read out all fault memories, process and delete existing faults if necessary.
Information
If control units are found to have faults that are not caused by control unit programming, these must
first be found and corrected.
7
Press •F3“ to start the integration test in the control unit selection.
All affected control units should now be successfully re-programmed or checked in the control unit
overview and their status.
Information
If a deviation in the integration test is still indicated despite programming being carried out, this must be
repeated. If the deviation persists, contact Technical Support.
Jul 10, 2025
Page 4 of 6
8
End the diagnostic application. Switch off the ignition. Disconnect the Tester from the vehicle.
9
Set battery charger back to a charge voltage of 14.4 volts.
AfterSales
Service
Technical Information
65/23
ENU
9152
9
Additional instructions on aborted programming
Information
If individual programming steps or rework could not be carried out correctly, see Workshop Manual for
the basic procedure for control unit programming using the PIWIS Tester. ⇒ Workshop Manual '9X00IN
Basic instructions and procedure for control unit programming using the PIWIS Tester - Section on
“Troubleshooting”'
In the event of a fault, logging must always be created during programming using •Ctrl“and •L“using the
PIWIS Tester.
Notes:
Control unit:
Situation:
Action:
Cancelling individual control
units:
One or more control units cannot
be programmed or can no longer
be accessed
•
•
•
•
•
Check on whether the
control unit can be accessed
using the PIWIS Tester or if
bus idle does not have to be
carried out
Control unit still not
accessible –> Remove fuse
for control unit –> Ignition on
–> Ignition off –> Re-insert
fuse
Control unit still not
accessible –> Disconnect
battery overnight
Check whether the control
unit is accessible
Carry out programming
individually using the
integration test (•F3“ in
the control unit overview
Central computer (PCM)
The central computer freezes
while loading
•
•
Starting programming again
Performing PCM factory
reset using the guided PIWIS
Tester procedure
Central computer (PCM)
The central computer control
unit cannot be accessed
•
Pulling out fuse for central
computer control unit –>
Ignition on –> Ignition off –>
Re-insert fuse
AfterSales
Jul 10, 2025
Page 5 of 6
9
Service
9152
ENU
Technical Information
65/23
Central computer (PCM)
Programming of the central
computer (PCM) aborts when
Fault 33 is detected
•
•
•
Fault 33 is displayed in the
central computer display
during programming
Start the update in the
Developer menu on the
central computer (PCM). The
update may only be started
from the Developer menu in
this case because the PCM
is already in the Developer
menu
If the update still cannot be
performed –> replace central
computer (PCM)
Central computer (PCM)
No start of programming
•
Programming is started
via the additional menu
and not in the central
computer (PCM) control
unit under Service / repairs
as described in the TI
Central computer (PCM)
Programming is not started or
programming is interrupted
•
For other topics that are not
listed in the TI, a PRMS ticket
must be created before
replacing the PCM system
Labor position and PCSS encryption
Labor position:
APOS
Labor operation
91522540
Programming central computer
I No.
PCSS encryption:
Location (FES5)
91520
Central computer
Damage type (SA4)
1614
function not as per specification
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.
© 2025 Porsche Cars North America, Inc.
Jul 10, 2025
Page 6 of 6
AfterSales
- Advanced VCI Box, Industry-leading J2534 Pass-Thru...
- High-Speed OEM-Level Diagnostics & Programming: Unlock true...
- Coverage for 17 Car Brands & Ultra Reliability: Works...
- User-Friendly RLink Platform & Expert Support: TOPDON’s...
- 6.6 ft USB-C Cable & Portable Storage Case: The RLink J...
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: No. 65-23
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- Obd2 Bluetooth Scanner Lifetime Update: Ediag Elite offers revolutionary Advantage Lifetime Updates with unlimited access to the superior 15 reset service, bidirectional testing and full system diagnostics.The Ediag Elite is an excellent Bluetooth obd2 scanner diagnostic tool ideal for diy's and private car owners
- Bidirectional Control for Quickly Locating Problems: The Bidirectional Scan tool allows you to send commands directly from your smartphone to your vehicle for active testing. This feature helps to quickly narrow down problems such as air conditioning clutches, windows, doors, sunroofs, etc., reducing diagnostic time for mechanics and helping Diy users locate faults more easily. In addition, Ediag Elite provides fault analysis and repair guidance to help you solve problems efficiently.
- 15 Maintenance Resets: The current version introduces 15 popular special features: Oil Reset, Headlight Matching, Bleeding Reset, TPMS Reset, BMS Reset, Gear Box Relearn, Throttle Learning, Injector Coding, SAS Reset and more special functions in system diagnose menu. These functions make it easy for owners to carry out the necessary maintenance and servicing, ensuring that your vehicle stays in top condition, prolonging its service life and preventing common problems and breakdowns. Note: The Special function vary by model& year, Reach us check compatibility.
- Wide Compatibility CANFD & FCA
Autoauth: Compatible with GM, Ford, Toyota, Chrysler, Honda, Mazda, Nissan, Mitsubishi, Hyundai, KIA with standard OBD2 port from 1996 to newer. More car brands and features will be released gradually. Newest Ediag Elite scanner supports CANFD Protocol and FCA cars. Note: Coverage may vary on different vehicle by model& year ,Please contact us to confirm compatibility before purchase. - Perfect for Monitoring The Health of Your Vehicle: Ediag Elite is designed to make vehicle maintenance simple and efficient. With intelligent AutoVIN quick recognition, it is easy to connect to your car without the need for manual input. Real-time data is visualized in a variety of formats, including graphs, numeric, meter displays and clear 4-in-1 data charts, allowing you to effortlessly monitor real-time data. Data logging/reporting is available for playback and further analysis.
- No Annual Fees & 2026 Upgraded CAN FD: Why pay $199/year or more for updates? The 2026 newest Kingbolen K7 obd2 scanner features have been upgraded to Lifetime Updates without subscription fees, saving you significant costs in the long run. K7 scan tool also adds the CAN FD protocol for the latest GM models (2019+), enabling faster data transfer, reducing the risk of undetected errors
- 2026 Newest Top-tier Car Scanner: Kingbolen K7 diagnostic scan tool is equipped with most capabilities for daily repair/maintenance: Wireless diagnosis via Bluetooth, Bidirectional Test, ECU Online/Offline Code, 31+ Resets, PMI for Ford, Lincoln, Mazda, Global version for 100+ brand vehicles and 17 languages, no area limit, FCA AutoAuth
- OE-Level Full Systems Scan Tool: K7 professional diagnostic scanner with Auto Vin can do one-click to scan ECUs on most of vehicles, like pcm, ecm, eps, bcm, tpms, sas, a/c system... to read/clear code, view live data, freeze frame, read ecu info. 4-in-1 data stream graphics can make data viewing more intuitive. Detailed diagnostic reports will help you easily master the car situation as it can be shared by bluetooth or email! Adding workshop information can help your customers to know more
- Bidirectional Test/Active Test & ECU Code: Stop guessing and start fixing. Bidirectional scan tool Kingbolen K7 can perform real active test that can send commands to the vehicle's ECU to drive the actuators to work, like window, rear mirrors, sunroof, door, solenoids, wipers, headlamp, etc, helping you quickly find out bad parts and pinpoint faulty issues. K7 bidirectional scanner will be a good choice to save money and time on car repairs when performing complex maintenance and repair
- 31 Reset Functions: Avoid expensive dealership visits for simple services. Experience tells us that just a small repair service may cost a lot of money. Kingbolen K7 is a professional diagnostic scanner with 31 common maintenance services like Oil /SAS/EPB/TPMS Reset, Battery Matching, ABS Bleeding, Injector Code, etc. It effectively handles most of the car reset and relearning jobs, perfect for experienced DIYers and mechanics. Note: Functions in the menu vary across vehicles. Kindly check the compatibility before purchase
- 【Cost-effective Diagnostic Scan Tool】Lifetime updates without fee, No subscription fee required, No IP restrictions, Ediag Elite bluetooth scanner stands out. It can perform in-depth Full System diagnostics,15+ Reset Services, powerful Active Test, CANFD & FCA AutoAuth. Connect your phone via Bluetooth for diagnosis, providing a faster, smarter and smoother diagnostic experience. Easy to put in pocket, convenient to carry, keep track of the car's status anytime, anywhere. Best bang for your bucks.
- 【15+ Reset Service, Easy Problem Solving】 KINGBOLEN Ediag Elite obd2 scanner diagnostic scan tool comes with 15+ professional reset functions, including: Oil Reset, ABS Bleeding, Injector Code, SAS Reset, TPMS Reset, BMS Reset, AFS Reset, Sunroof Calibration, Brake Reset and more special functions in system diagnose menu. The ideal bluetooth scanner for mechanics and DIY enthusiasts, which can save unnecessary maintenance costs and significantly shorten repair time.
- 【Comprehensive Full Systems Diagnostic】 The Ediag Elite obd2 scanner bluetooth supports full system In-Depth diagnosis. It can read/clear fault codes, read real-time data/freeze frame, module information, and perform testing and reset functions for ECM, BCM, ABS, SRS, TPMS, TCM, BMS, SAS, A/C & RTM systems ect. It works with most car models after 1996, cover more than 150+ car brands. Supports 22 global languages for your convenience(EN, FR, ES, DE, IT, RU, PT, JP, TU...)
- 【Powerful Bidirectional Scan Tool & Active Test】 The obd2 code reader for Ediag Elite can perform real time active test that can send commands to the vehicle’s ECU to drive the actuators to work, such as turn on the radiator fan, modulate the throttle, open/close windows, etc. It can help you quickly find out the bad components and the cause of the fault, which can save you a lot of time. With BT 5.2 wireless connectivity, you can enjoy wireless diagnostics up to 33 feet.
- 【FCA AutoAuth & CANFD Compatibility】 Ediag Elite scan tool offers support with FCA Gateway Access, allowing you to perform protected functions on FCA vehicles, including Chrysler, Dodge, Jeep, Alfa Romeo, Fiat vehicles, etc.(Note:just allows you to access the FCA, but need to have your own FCA account) Supports the CAN-FD protocol, provide high-speed vehicle diagnostic communication and data transfer, working perfectly on GM vehicles produced after 2020, saving $100 to buy a CAN FD adapter.
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.