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Service bulletin GCUS-3-412

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 id10080073
Published by NHTSA2016-09-14
Manufacturer's numberGCUS-3-412
Manufacturer's date2016-01-22
NHTSA componentENGINE

NHTSA's summary

15671A - SERVICE UPDATE (REVISED SERVICE PROCEDURE). REPOSITION THE MAIN BODY WIRING HARNESS BRANCH LOCATED IN THE ENGINE COMPARTMENT ON CERTAIN VEHICLES EQUIPPED WITH 3.6L DOHC V6 ENGINE (RPO LFX). IF THE HARNESS IS NOT ROUTED PROPERLY, THE ENGINE MAY NOT START, HAVE REDUCED POWER, SHUT OFF OR STALL WHILE DRIVING. THIS CONDITION COULD HAVE OTHER EFFECTS, INCLUDING THE CENTER HIGH MOUNT STOP LAMP (CHMSL), TURN SIGNAL LIGHTS OR HEADLIGHTS BECOMING INOPERATIVE.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CHEVROLET COLORADO2015
GMC CANYON2015

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

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