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Service bulletin 18NA032

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 id10137317
Published by NHTSA2018-05-21
Manufacturer's number18NA032
Manufacturer's date2018-02-08
NHTSA componentELECTRICAL SYSTEM; EXTERIOR LIGHTING:TURN SIGNAL:SWITCH

NHTSA's summary

This technical bulletin provides a procedure to replace the turn signal switch with the correct one due to the wrong one being installed at the plant.

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

Electrical system, Lighting, Turn signals

Vehicles listed
GMC TERRAIN2018

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
174272021-04-30. Service bulletin. Condition Certain 2018 model year GMC Terrain vehicles equipped with a trailer package (RPO V92) may have a trailer turn signal and brake lamp that is inoperative on a connected trailer due to an incorrect calibration. Correction Dealers are to reprogram the body control module.