Exhaust brake

Years 1996–97, 2014, 2016–19, 2021–23, 2025–27 Models 6 Factory citations 19

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Also described as Engine brake, exhaust

Also documented for GMC

Documented applications

Colorado — Second generation (GMT31XX) (2015–2022)

2016–2019, 2021–2022 Factory-verified

with LWN; not on extended cab LT and Z71 models (2018 guide); 2018 from GM's 2018 Colorado order guide (PDF); 2021 from the upfitter list GM files for 2021 and 2022

GM factory document — 2016 chevrolet canyon colorado electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet canyon colorado electrical body builders manual service manual 2017 en us, p.11.
GM factory document — 2019 chevrolet 19 coloradocanyon body builder sm u 2018aug01 1, p.11.
GM factory document — 2022 chevrolet 22 canyon colorado electrical body builder sm en us 2021oct15, p.11.
GM factory document — 2018 chevrolet colorado order guide copy gm authority, p.72.

Motor Home chassis (1983–1998)

1996–1997 Factory-verified

only in: 92 models; not available with MT9

GM Heritage factory kit — 1996 Chevrolet Motorhome, p.26.
GM Heritage factory kit — 1997 Chevrolet Motorhome, p.20.
GM factory document — 1997 chevrolet chevy p32 rv van chassis rpo code list, p.1.

Silverado HD — GMT900 (2007–2014)

2014 Factory-verified

comes only with LML

GM factory document — 2014 chevrolet silverado 3500hd cc fleet order guide wayback, p.4.

Silverado HD — K2XX (2015–2019)

2016–2019 Factory-verified

comes with the Duramax diesel; 2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide

GM factory document — 2016 chevrolet silverado 2500hd fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet silverado 2500hd order guide revised august 12 2016 copy gm authority, p.55.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.70.
GM factory document — 2019 chevrolet silverado 2500hd order guide april 20 2018 iteration 2 copy gm authority, p.71.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.11.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified

GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of K40 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.