L8S ✓ Factory-verified

GMC · Regular Production Option

Engine, V8, direct injection, variable valve timing, gasoline

Years 2027 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2027 ✓ Factory-verified

  the 2027 guides list this gasoline V8 where the 2025 and 2026 guides list L8T; Pro, SLE, SLT, AT4, AT4X, Denali: S; Denali Ultimate: not offered

  ⛭ GM factory document — 2027 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, p.9.

Related codes · mentioned in these notes

L8T

This page aggregates every documented appearance of L8S in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.