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Service bulletin 21NA079

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 id10198870
Published by NHTSA2021-07-06
Manufacturer's number21NA079
Manufacturer's date2021-05-03
NHTSA componentSEATS

NHTSA's summary

This technical bulletin provides a procedure to replace the lower seat frame to correct the condition of Pop Noise Heard During Seat Travel and/or Inadequate Seat Rearward Travel due to a supplier installation error.

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

Seats

Vehicles listed
CHEVROLET SILVERADO 15002021 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002021 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 15002021 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002021 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
20206452020-12-23. Seats And Restraints
20206242020-12-17. Seats And Restraints

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
24-NA-2392025-01-30. Service bulletin. This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
PIT61802024-08-13. Service bulletin. This Preliminary information communicates assistance in locating the Rear seat belt comfort guides in the parts catalog.
06-00-89-029V2024-05-16. Service bulletin. This service bulletin includes information on Interior Cleaning - Instrument Panel (IP), Hard or Plastic Surfaces, Seats, Carpet, Leather, Vinyl, Fabric Cleaner, Stain Remover, Restorer - Product Availability.
21NA0792021-07-19. Service bulletin. This technical bulletin provides a procedure to replace the lower seat frame to correct the condition of Pop Noise Heard During Seat Travel and/or Inadequate Seat Rearward Travel due to a supplier installation error.