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Service bulletin 18NA107

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 id10137544
Published by NHTSA2018-05-21
Manufacturer's number18NA107
Manufacturer's date2018-04-06
NHTSA componentSTRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS

NHTSA's summary

This technical bulletin provides a procedure on how to install a lower cross member to correct the condition of if the cross member rusts away.

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

Body and frame

Vehicles listed
CHEVROLET SILVERADO 15002007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 25002007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 25002007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA DENALI2007, 2008, 2009, 2010 (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.

Other bulletins for the same vehicles and component
23-NA-2192024-11-05. Service bulletin. This service bulletin provides information on Concerns or Questions Regarding Installation of Dealer Installed Accessories.
PI0437A2024-05-06. Service bulletin. Appearance of Discoloration or Corrosion Near Edges.
PI0281K2024-02-14. Service bulletin. This preliminary informational (PI) bulletin provides information to dealership personnel which may be helpful when addressing underbody component corrosion with customers.
PIT52012023-12-26. Service bulletin. Driver or Passenger Door Module DTC B2555.
PIT5180A2023-12-26. Service bulletin. Whistle Noise From Drivers Side A Pillar Area.
PIT51802023-12-26. Service bulletin. Whistle Noise From Drivers Side A Pillar Area
PIT52012023-12-11. Service bulletin. Driver or Passenger Door Module DTC B2555.
PIT5180A2023-12-11. Service bulletin. Whistle Noise From Drivers Side A Pillar Area.
PIT51802023-12-11. Service bulletin. Whistle Noise From Drivers Side A Pillar Area
120421001B2023-12-04. Service bulletin. Transfer Case Identification First Design vs. Second Design