Engine, 3.6L V6, SIDI (spark ignition direct injection), variable valve timing (VVT)

Years 2013–17 Models 2 Factory citations 4

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Also described as Engine, 3.6L V6, SIDI, DOHC, VVT, 305 hp at 6800 rpm, 269 lb-ft at 4000 rpm

Also documented for Buick Cadillac Chevrolet

Documented applications

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

2015–2016 Factory-verified

2015: Canyon, SLE, SLT: O; SL: not offered; 2016: SLT: S; Canyon, SLE: O; SL: not offered; LGZ replaces it from 2017

GM factory document — 2015 gmc canyon fleet order guide wayback, p.6.
GM factory document — 2016 gmc canyon fleet order guide wayback, p.2.

Terrain — First generation (2010–2017)

2016–2017 Factory-verified

SLE-2, SLT, Denali: O; 301 hp (224.4 kW) at 6500 rpm and 272 lb-ft (367.2 N-m) at 4800 rpm; the 2013–2015 years are in the separate single-source row

GM factory document — 2016 gmc terrain fleet order guide wayback, p.4.
GM factory document — 2017 gmc terrain fleet order guide wayback, p.4.
2013–2015 Single-source

LFX replaced LF1 for 2013; GM Authority's Terrain page only, which does not credit GM for its codes; no factory page in the archive

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