Engine, Duramax turbo-diesel V8, B20 diesel compatible

Years 2027 Models 1 Factory citations 1

Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027)

2027 Factory-verified

includes engine block heater (K05); the 2027 guides list this Duramax diesel where the 2025 and 2026 guides list L5P

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 L6P in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.