# 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.

- Type: Service bulletin
- NHTSA id: 10187758
- Published by NHTSA: 2021\-03\-01
- Manufacturer's number: 20NA121
- Manufacturer's date: 2021\-01\-20
- NHTSA component: VISIBILITY: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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187758-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187758-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Glass, wipers and mirrors, Sunroof

## Vehicles listed

- 2020 to 2021 BUICK ENCORE GX
- 2021 CHEVROLET TRAILBLAZER

## Other bulletins for the same vehicles and component

- [PIC5260F](/bulletins/10216372.md), 2022-07-25, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. 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.
- [PIC5260E](/bulletins/10211770.md), 2022-05-16, Service bulletin: VISIBILITY:SUN/MOON ROOF ASSEMBLY. 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.

JSON: [/v1/bulletins/10187758](/v1/bulletins/10187758)

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