NHTSA ID Number: 11015198
Manufacturer Communication Number: No. 2308.7
TSB/Document Date: 2025-03-06
Summary
Advanced Technical Information - Lightweight Glass Panes Cracked – Identification and Possible Causes
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Lightweight Glass Panes Cracked – Identification and Possible Causes
Vehicles Affected
Models
Model Year
Model Type
VIN Range
Vehicle-Specific Equipment
911
2021 - 2025
992110
992120
991130
992140
992150
992410
992420
992430
992440
992450
992460
992810
992820
992850
n/a
+VW4
Revision History
Revision
Release Date
Changes
0
April 7, 2023
Original document
1
April 27, 2023
Update of Technical Background and Service Information
2
May 1, 2023
Update of PartIDs
3
June 26, 2023
Update of Technical Background and Service Information
4
August 21, 2023
Update of MY
5
October 3 , 2023
Update of Technical Background and Service Information
6
December 12, 2024
Addition of reference to ATI Group 6 2435
7
February 25, 2025
Update of MY
AfterSales
Feb 25, 2025
Page 1 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Condition
This document addresses various cracks in the lightweight exterior glass panes of the 911.
This document is not applicable to cracks caused by external influence.
This document only applies to vehicles with the option VW4 – Lightweight and Noise Insulated Glass.
Technical Background
The various types and causes of cracks in the lightweight exterior glass panes of the 911 are outlined below.
Door glass: Cracks in the top corner (driver or passenger side)
Figure 1 - Door glass: cracks in the top corner
There are two main causes for this condition:
->
The door glass is misaligned, which can cause contact between the door glass and the rear quarter glass, or
->
Force applied to the glass (i.e., instead of the door sill) throughout the door closing process can bend the
glass enough to cause contact with the rear quarter glass, despite a proper window alignment with no force
applied.
Updated lightweight door glass parts have been developed to address this complaint. Please see the Door glass:
cracks in the top corner section of the Service Information for repair instructions.
AfterSales
Feb 25, 2025
Page 2 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Rear quarter glass (side window pane): cracks near front edge
Figure 2 - Rear quarter glass (side window
pane): cracks near front edge
There are two main causes for this condition:
->
The door glass is misaligned, which can cause contact between the door glass and the rear quarter glass, or
->
The quarter glass mounting nuts are over-torqued
This condition is possible on both the driver and passenger sides of the vehicle.
Please see the Rear quarter glass (side window pane): cracks near front edge section of the Service Information for
repair instructions.
Please also see: ATI Group 6 2435 - 992 Lightweight Rear Quarter Glass Panes Are Cracked
AfterSales
Feb 25, 2025
Page 3 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Rear window glass: various cracks
Figure 3 - Rear window glass: various cracks
Stress cracks in the rear window glass are currently being analyzed by Porsche
. The root causes for the different
kinds of stress cracks are unknown at the time of publication of this document.
Please see the Rear window glass: various cracks section of the Service Information for repair instructions.
AfterSales
Feb 25, 2025
Page 4 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Front windshield: various cracks
Figure 4 - Front windshield: various cracks
The stress cracks in the front windshield are caused by too much stress in the outer glass pane. Updated parts have
been developed to address this issue.
Please see the Front windshield: various cracks section of the Service Information for repair instructions.
AfterSales
Feb 25, 2025
Page 5 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Service Information
Door glass: cracks in the top corner
Please replace the affected glass pane(s) with the updated parts (index “H”), as instructed in WM 644019 – Re-
moving and installing door window glass.
Rear quarter glass (side window pane): cracks near front edge
Please replace the affected glass pane(s) as instructed in WM 647519 – Removing and installing side window
(Coupe).
Please exercise additional caution when tightening the fastening nuts for the glass pane. Applying too much torque
to the fastening nuts may cause the glass pane to crack.
Rear window glass: various cracks
Please replace the rear window glass as instructed in WM 648619 – Removing and installing rear window.
Front windshield: various cracks
Updated parts are available since September 4, 2023.
Please replace the front windshield as instructed in WM 641219 – Removing and installing rear windscree, with the
latest available version in PET.
Warranty
As always, please document the repair completely in PCSS.
For this repair, please code to the appropriate “cause” from below:
Cause location:
64400 Front door window
Cause symptom:
1521 Crack/fissure
or
Cause location:
64750 Side window pane
Cause symptom:
1521 Crack/fissure
or
Cause location:
64860 Rear window
Cause symptom:
1521 Crack/fissure
or
Cause location:
64120 Windshield
Cause symptom:
1521 Crack/fissure
Use the appropriate labor operations for each glass pane replaced.
Additional labor operations may be claimed only as needed.
Cracks caused by outside influence (e.g., impact) may not be claimed under Warranty.
AfterSales
Feb 25, 2025
Page 6 of 7
Bulletin #: 2308.7
Part ID: 6440, 6475,
6486, 6412
Advanced Technical Information
6
Serach Items
992, 911, Lightweight glass, VW4, stress crack, door glass, windshield, window
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.
K13914, K14059, K15676, K16685
©2025 Porsche Cars North America, Inc.
AfterSales
Feb 25, 2025
Page 7 of 7
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TSB/Document ID: No. 2308.7
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY/WIPER
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