Engine, Duramax 6.6L turbo-diesel V8, B20 diesel compatible

Years 2017–19, 2023, 2025–27 Models 2 Factory citations 7

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Also documented for GMC

Documented applications

Silverado HD — K2XX (2015–2019)

2017–2019 Factory-verified

445 hp (332 kW) at 2800 rpm and 910 lb-ft (1220 Nm) at 1600 rpm in the 2018 guide; requires MW7 and GT4; includes exhaust brake (K40) and engine block heater (K05); 2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: the 2019 2500HD trailering page names it

GM factory document — 2019 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.26.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.38.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

only in: 2500 HD, 3500 HD, 3500 HD chassis cab; 2027: 3500 HD Crew Cab model CK30943 (3500 HD engine/axle table)

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 3500 hd retail and fleet fleet order guide, p.75.

This page aggregates every documented appearance of L5P in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.