NHTSA ID Number: 10187799
Manufacturer Communication Number: No. 177-20
TSB/Document Date: 2021-03-02
Summary
instruction on how to reprogram the connect control unit in the 992 generation 911 if the event that the 12V battery is discharging due to a closed circuit current.
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)
- 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...
This product presentation was made with AAWP plugin.
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. 177-20
Replacement Service Bulletin Number:
MFR Communication Date: 2021-02-03
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 |
Service
Technical Information
177/20 ENU
9125
9
Complaint - 12 Volt Battery Discharging Due to Closed-Circuit Current: Re-Program
Connect Control Unit (177/20)
Model Line:
911 Carrera (992)
Model Year:
As of 2020
Concerns:
Connect control unit (external communication control unit)
Symptom:
The Porsche
Vehicle Tracking System (PVTS) is activated. After standing idle for three to four days, the
vehicle electrical system battery is completely discharged by the closed-circuit current and the vehicle
cannot be started.
Cause:
A Porsche Vehicle Tracking System (PVTS) alarm triggered in connection with lack of reception (in an
underground parking lot, for example) can cause this fault. The Connect control unit (external communication control unit) tries to send the alarm message until the battery is fully discharged.
Remedial
Action:
In the event of a customer complaint, check the software version and reprogram the Connect control unit
(external communication control unit) with the appropriate programming code.
Information
The total time required for control unit programming is approx. 15 minutes.
Required tools and parts
Information
The 911 (992) may be equipped with a lithium-ion 12V battery (I-no. J2A).
Lithium starter batteries must only be charged using a suitable battery charger that has a current
and voltage-controlled charge map.
For further information about the battery chargers to be used, see Workshop Manual '270689
Charging battery/vehicle electrical system'.
Tools:
•
•
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
9900 - PIWIS Tester 3 with PIWIS Tester software version 39.900.040 (or higher) installed
AfterSales
Feb 3, 2021
Page 1 of 5
9
Service
9125
Parts Info:
Technical Information
177/20
ENU
Parts required (if necessary):
Part No.
9Y0915107HY
9A7915989A
9A7907729
Designation
– Use
Battery (I-no. J2A)
Vehicle electrical system
Battery for emergency power operation
(I-no. IV2)
Connect control unit
Battery cover
Connect control unit
Qty.
1 ea.*
1 ea.*
1 ea.*
* Replace parts only if necessary
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 getting started, connect a suitable battery charger with a current rating of at least 90 A to the
jump-start terminals.
NOTICE
Control unit programming will be aborted if the WLAN connection is unstable.
•
An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle
communication module (VCI). As a result, programming may be aborted.
During control unit programming, always connect the PIWIS Tester to the vehicle communication module
(VCI) via the USB cable.
Work Procedure: 1
Charging vehicle electrical system battery, see Workshop Manual '270689 Charging
battery/vehicle electrical system'.
•
•
2
Feb 3, 2021
Page 2 of 5
Once the vehicle electrical system battery is charged, continue with step 2.
If the battery cannot be charged, follow TI 31/20 section Charging, see Technical Information '270689 Information - Handling 12 Volt Lithium-Ion Battery (Vehicle Electrical System
Battery) (31/20)'. If a defective vehicle electrical system battery is subsequently detected,
replace the vehicle electrical system battery, see Workshop Manual '270655 Replacing
battery/vehicle electrical system'.
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"'.
AfterSales
Service
Technical Information
3
177/20 ENU
9125
9
Read out the software version.
3.1
Select 'Connect' control unit.
3.2
Select the "Extended identifications" tab.
3.3
Check the software version.
•
•
If the software version is older than '0412', re-program the Connect control unit.
If the software version is already '0412', end of action required.
Reprogramming the Connect control unit (external communication 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:
Required PIWIS Tester software version:
39.900.040 (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:
A4V7H
Programming sequence:
Read and follow the information and instructions
on the PIWIS Tester during the guided programming
sequence.
During the programming sequence, the Connect
control unit (external communication control unit) is
re-programmed and then automatically re-coded.
Do not interrupt programming.
Programming time (approx.):
15 minutes
AfterSales
Feb 3, 2021
Page 3 of 5
9
Service
9125
ENU
Technical Information
177/20
Software version programmed during this
campaign:
0412
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
Following control unit programming, the software
version can be read out of the Connect control unit in
the 'Extended identification' menu using the PIWIS
Tester.
Check the external communication control unit battery and replace battery if necessary, see
Workshop Manual '912501 Checking external communication control unit battery'.
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:
Depending on the required scope of the actions to be taken for documentation and billing in the event of
warranty, indicate the following labor operations, PQIS coding and part numbers in the warranty application:
Depending on the required scope of the measures to be carried out, in a warranty case the appropriate
labor operations, PQIS coding and part numbers must be selected and indicated in the warranty application:
I No.
APOS
Labor operation
91250140
Checking external communication control unit
(checking software)
91252540
Programming external communication control
unit
91252553
Programming external communication control
unit battery (checking battery)
91255503
Replacing external communication control unit
battery
27065500
Replacing vehicle electrical system battery
Feb 3, 2021
Page 4 of 5
AfterSales
Service
Technical Information
177/20 ENU
9125
9
PQIS coding:
Location (FES5)
91250
External communication control unit
Damage type (SA4)
1614
Function not as specified
Parts Info:
Parts required (if necessary):
Part No.
9Y0915107HY
9A7915989A
9A7907729
Designation
– Use
Battery (I-no. J2A)
Vehicle electrical system
Battery for emergency power operation (I-no.
IV2)
Connect control unit
Battery cover
Connect control unit
Qty.
1 ea.*
1 ea.*
1 ea.*
* Replace parts only if necessary
References:
Technical Information '9X00IN Information - Handling 12-volt lithium-ion batteries (vehicle electrical
system battery) (31/20)'
Workshop Manual '270689 Charging battery/vehicle electrical system'
Workshop Manual '270655 Replacing battery/vehicle electrical system'
Workshop Manual '912555 Replacing battery on control unit for external communication'
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.
6000011712
AfterSales
Feb 3, 2021
Page 5 of 5
- Affordable Solution for Professional-grade Car Diagnostics & Repair: As the budget-friendly OBD2 scanner under $300, the VD70 Lite car diagnostic tool offers 31+ hot resets, full bi-directional controls with 4000+ active tests, all system diagnostics, 8-in-One live data graphing (export as CSV Export/Recording/Playback), CAN FD & DoIP protocols, and long-term free update. Additional features include Auto VIN & Auto Scan, diagnostic report sharing/printing, with coverage for over 10,000 vehicle models worldwide, suitable for DIYers, Car Owners, Technicians, and Mechanics on car repairs and maintenance tasks.
- OBD2 Scanner with Full Bi-directional Control: The Bidirectional scan tool VIDAGTOOL VD70 Lite performs 4000+ active tests that can send execution commands to the ECU module and identify the repair status, covering for windows, doors, ABS, valves, wipers, headlights, rear mirrors, sunroof,and more in-vehicle components. This bidirectional OBD2 scanner is a must-have diagnostic tool for auto technicians and mechanics on a budget! The available function tests vary by model—please check compatibility via vdiagtool2 @ outlook . c o m before purchase.
- OE All Systems Diagnostics & 8-IN-One Data Graphing: VD70 Lite is a dealer-level car scanner diagnostic tool with Auto VIN that can do in-depth diagnostics for 100+ modern car brands, covering all systems including engine, transmission, airbag, ABS, ESP, TPMS, radio, etc, to read/clear code, view live data, freeze frame, and read ECU info. This advanced OBD2 Scanner with 8-in-one data graphing and detailed diagnostic reports makes data viewing more intuitive, ensures quickly accurate repairs by identifying issues, and easily masters the car situation.
- Stay Ahead with 31+ Reset for Faster & Easier Repairs: VDIAGTOOL VD70 Lite scanner for car meets almost all daily maintenance needs for both home mechanics and workshops as a professional automotive scan tool. It can perform Oil Reset, ABS Bleed, Crank Sensor Relearn, Idle Relearn, Injector Coding, Window Initialization, HVAC Calibration, Suspension Calibration, Throttle Matching, etc, ensuring efficient repairs and complete maintenance. Besides, long-term free updates keep its functionality and broad vehicle compatibility up to date. Functions vary by model, please send us the Vehicle Model, Year, VIN for compatibility before purchase.
- 150+ Models, 10000+ Car Coverage & 22 Languages：As a powerful car computer diagnostic tool, VD70 Lite helps you to quickly troubleshoot issues for 95% of US, European, and Asian vehicles. Supporting 22 languages makes it a global car diagnostic scanner for auto mechanics worldwide without language barriers. Note: Simply provide your tool’s S/N and reach out to vdiagtool2 @ outlook . c o m to change the menu language.
- Smarter Diagnostics, Broader Coverage, Greater Value Than $1,000+ Tools: The game-changing VD80BT OBD2 scanner delivers 4000+ active tests, 42+ hot services, advanced ECU coding, PMI & V.A.G Guided—all in one scanner for car. With OE-level full system scan and intelligent topology mapping that cuts diagnostic time by up to 50%, you'll work smarter and faster. Supporting FCA
AutoAuth, CAN FD & DoIP protocols, this car scanner covers over 10,000 vehicle models worldwide. Built for serious pros and DIYers, it features 8" HD screen & 4+64GB storage, 7.3V fast charging with long-lasting battery, and 33–66ft stable wireless connection—making it the most complete diagnostic solution you’ll ever own - Intuitive Topology Map, Fast Locate Faults: Why waste time clicking module by module? VD80BT car diagnostic scanner takes diagnostics to the next level with its intuitive Topology Map—a premium feature usually found in $1000+ obd scanner. With one tap, it performs all system scan and presents all modules and DTCs in a clear, color-coded layout, boosting diagnostic efficiency by up to 200% and helping you locate issues instantly and reduce repair time and costs. Whether you're a pro boosting efficiency or a beginner learning diagnostics, this obd2 scanner diagnostic tool makes fault-finding faster and smarter for you. Note: varies by vehicle model, please check compatibility before purchase
- Wireless Connectivity Simplifies Bi-Directional Control: With 4000+ active tests, including throttle reset, window calibration and solenoid check, VD80BT bidirectional scan tool lets you diagnose and verify functions faster, smarter, and more efficiently. This scanner for car redefines flexibility in bi-directional control through a fully wireless connection, freeing you from the constraints of wired car diagnostic tool in the workshop. Imagine actively controlling components like the A/C clutch, fuel injector, ABS pump, or radiator fan within a wireless range of 33–66ft around the vehicle—all while enjoying stable, high-speed wireless diagnostic and real-time data monitoring
- 42+ Hot Services, One Powerful Scanner for Car: Why pay a shop $100 just to reset a light? VD80BT car scanner diagnostic tool gives you 42+ hot services from basic resets to advanced maintenance tasks like Crank Sensor Relearn, Injector Coding, ABS Bleeding, Oil Reset, Throttle Relearn, EPB, BMS Reset, Tire Size Reset and more. Plus, it offers 100+ vehicle-specific features including Idle Relearn, VIN Write, Brake Fluid Replacement, Fuel Trim Reset, ABS Initialization and more. Whether you’re resetting TPMS or fixing a stubborn SAS, this car computer diagnostic reader delivers shop-grade precision at a fraction of the cost. Varies by model. Send VIN to verify compatibility before purchase
- OE-Level Full System Diagnostics in Your Hands: Dominate diagnostics like a dealership with VD80BT scan tool for all vehicles, delivering factory-grade scanning for aLL systems—including ABS, SRS, ECM, TCM and more. View up to 8 PID graphs simultaneously to quickly catch intermittent issues and troubleshoot with confidence. Easily read and clear DTCs, retrieve freeze frame data, and run active tests for faster, more accurate repairs. It’s like having a dealership-grade scan tool in your pocket, complete with data playback and CSV export for in-depth analysis. Stop guessing and start fixing with surgical precision—professional diagnostics made simple and portable. Check compatibility Please
- 【OE-Level Full System Diagnostics-Lifetime F*REE Software Updates】The VDIAGTOOL D200 OBD2 Scanner for cars is a all system bidirectional scan tool that enjoy lifetime f*ree software updates, delivers complete system coverage. reading/clearing codes across engine, transmission, ABS, SAS, EPB, TPMS plus full access to body, chassis, powertrain and all control modules. This D200 Bidirectional car scanner works with most 1996+ OBD2 gasoline and hybrid cars and light trucks. It does NOT support pure electric and heavy-duty trucks. PLEASE CHECK COMPATIBILITY BEFORE ORDERING or Contact us with VIN to confirm compatibility.
- 【Supports OBD2 Full Functions-ZERO Subscription Fees】D200 Bidirectional OBD2 Scanner is a upgarde of universal car code reader. It supports OBD2 full functions to help you turn off the annoying instrument fault indicator, such as read/clear codes, O2 sensor test, I/M readiness, on-board monitor test, datastream, freeze frame, E-VAP system test, and retrieve vehicle information. This professional obd2 scanner diagnostic tool can full access to diagnostics, reset tools and maintenance features with a single payment. NOTE: The fault code can only be cleared after the vehicle's malfunction has been repaired; please ensure the vehicle issue is fixed before clearing the code.
- 【D200 Hidden 2 Advantages: 1. $169 Expandable 49+ Advanced Resets. 2. $199 Get J2534 P*a*s*s-Thru Programming】Your core car diagnostics and 26 reset remain lifetime f*ree for everyday maintenance. When you need deeper repair capability, upgrade with 3-year access for $169 in Store on VDIAGTOOL App, gaining 49+ advanced resets. D200 configured with J2534 hardware, upgrade only when you need without replacing the entire device. You also can Lifetime Unlock for $199 in Store one-time, perform module programming, software re~flashing and ECU data updates directly. Supports 17+ major brands, including for BMW, for Audi, for GM, for Ford and more. Note:D200 does‘t provide any OE software.
- 【Full Bidirectional Control / Active Tests】The D200 car scanner diagnostic tool is a true bidirectional scan tool that lets you send commands directly to the vehicle’s ECU for active tests. Quickly test fuel pumps, relays, solenoids, injectors, cooling fans, windows, sunroofs and more to verify operation instantly. Get dealership-level diagnostic control at a fraction of the cost (ofter $100-200$ per diagnostic visit), reduce guessworkand confirm repairs faster, avoid unnecessary parts replacement, towing fees and wait times.
- 【26 F*ree Essential Reset & Relearn Functions – Everyday Maintenance Made Easy】Handle common maintenance and repair jobs without visiting the shop. The D200 code readers & scan tools includes 26 f*ree high-demand reset functions, including Oil Reset, EPB Service, SAS Calibration, ABS Brake Bleeding, Throttle Relearn, Injector Coding, Headlight Adjustment, Tire Size Reset and more. Perfect for home car owners, mechanics and DIYers – just plug and diagnose anytime, anywhere! Note: Service functions vary by vehicle model—please confirm compatibility.
This product presentation was made with AAWP plugin.
Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API