Tonneau cover, hard, folding

Years 2003–08, 2016, 2018–19 Models 4 Factory citations 16

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Also described as Cover, rear compartment, hard folding, cargoCargo security cover, rigid, removable

Also documented for Buick GMC

Documented applications

Colorado — GMT355 (2004–2012)

2004–2008 Factory-verified

GM factory document — 2004 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet colorado pickup 2wd rpo code list, p.1.

Silverado — GMT800 (1999–2007)

2003–2007 Factory-verified

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Silverado SS, p.207.
GM Heritage factory kit — 2005 Chevrolet Silverado 1500HD, p.127.
GM Heritage factory kit — 2005 Chevrolet Silverado 1500, p.197.
GM Heritage factory kit — 2006 Chevrolet Silverado, p.270.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.276.

Silverado HD — GMT800 (2001–2007)

2003, 2004 Factory-verified

years from Heritage kit pages, not in GM’s service list of that year: 2003 (order guide)

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.236.

Trax — first US generation (2015–2022)

2016, 2018–2019 Factory-verified

all trims: S; GM Authority's 2020 changes page says it left the LS's standard equipment for 2020

GM factory document — 2016 chevrolet trax fleet order guide wayback, p.2.
GM factory document — 2018 chevrolet trax order guide copy gm authority, p.14.
GM factory document — 2019 chevrolet trax order guide copy gm authority, p.14.

This page aggregates every documented appearance of EN6 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.