Information on General Guidelines to Address Sunroof Waterleak Issues – 2016-2020 Cadillac CT6

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Service Bulletin Bulletin No.: 21-NA-258
Date: November, 2021
INFORMATION
Subject: Information on General Guidelines to Address Sunroof Waterleak Issues
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Cadillac CT6 2016 2020 — — All All
Involved Region or Country United States, Canada, Russia, Europe, Israel, Middle East, China, Cadillac Korea
(South Korea), Japan
Additional Options (RPOs) Equipped with ROOF-SUN, GLASS, SLIDING, ELEC, TRANSPARENT GLASS FIXED
(RPO C3U)
Condition
Some customers may comment on seeing water leaking from the sunroof area.
Customers may also comment on hearing water rushing as they drive the vehicle.
Cause The cause of the condition may result from sunroof drain hose and drain concerns, or the
sunroof frame.
Correction
Note: Based on warranty claims, waterleaks may originate from sealing problems within
the sunroof housing, or from front and/or rear drain hoses that were not properly
connected from the assembly plant. Referencing the latest version of PIC5260 might be
helpful in diagnosis of a sunroof waterleak issue.
Perform a water test, if the waterleak is duplicated, the technician should use the general
inspection guidelines below to root cause the condition:
Page 2 November, 2021 Bulletin No.: 21-NA-258
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• Inspect the sunroof drain hose to confirm it is installed in the proper location and that it
is not kinked.
• Verify that the drain is not plugged. Clean any blockages.
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• Reconnect any loose drain hoses.
• Replace any missing drain hose parts.
• Inspect sunroof housing for any damaged or deformed seals (1), and replace as
necessary.
• Replace any sunroof housing that shows evidence of water leaks.
Bulletin No.: 21-NA-258 November, 2021 Page 3
Parts Information
Parts are not always required for this repair.
Warranty Information
For vehicles repaired under warranty, submit the
appropriate labor operation for the repair performed.
Version 1
Modified Released November 09, 2021

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