Engine, 6.6L V8, Dynamic Fuel Management

Years 2027 Models 1 Factory citations 2

Documented applications

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation, AT4: not offered; AT4X, Denali: O; Denali Ultimate: included in the trim group, upgradeable; 481 hp (358 kW) at 5800 rpm and 501 lb-ft (679 Nm) at 4000 rpm; listed on the Crew Cab models only (TK15543, TK15743), with MHS and GU5

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.23.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of L78 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.