WenmarOpen by Wenmar Pro

Service bulletin 20NA121

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10187758
Published by NHTSA2021-03-01
Manufacturer's number20NA121
Manufacturer's date2021-01-20
NHTSA componentVISIBILITY:SUN/MOON ROOF ASSEMBLY

NHTSA's summary

This service bulletin provides a procedure to locate and fix a possible leak in the roof area due to missing sealant.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Glass, wipers and mirrors, Sunroof

Vehicles listed
BUICK ENCORE GX2020, 2021
CHEVROLET TRAILBLAZER2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PIC5260F2022-07-25. Service bulletin. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
PIC5260E2022-05-16. Service bulletin. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.