Exhaust brake

Years 2014–19, 2021–22, 2024–27 Models 4 Factory citations 12

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Also documented for Chevrolet

Documented applications

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

2016–2017, 2019, 2021–2022 Factory-verified

2016: SLE, SLT: O; SL, Canyon: not offered; with LWN; not on extended cab; 2021 from the upfitter list GM files for 2021 and 2022

GM factory document — 2016 gmc canyon fleet order guide wayback, p.2.
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.

Sierra HD — GMT900 (2007–2014)

2014 Factory-verified

comes only with LML

GM factory document — 2014 gmc sierra 2500hd fleet order guide wayback, p.4.
GM factory document — 2014 gmc sierra 3500hd fleet order guide wayback, p.4.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified

comes with the Duramax diesel; 2015 marks: Sierra, SLE, SLT: O; 2018: GM's 2018 Sierra 2500HD order guide; 2019: GM's 2019 Sierra 3500HD order guide

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.4.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.48.
GM factory document — 2019 gmc sierra 3500hd order guide copy gm authority, p.46.

Sierra HD — T1XX (2020–2027)

2024–2027 Factory-verified

2024: GM Authority 2024 changes page

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

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