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

LS and LT; 323 hp; new for 2012, replacing LLT (GM Authority 2012 RPO changes); GM Authority 2014 RPO list; no 2013 or 2015 source names the code

Wikipedia's engine table lists LFX for 2011–2017, but its text names the V6 LLT and says it arrived after the V8; GM Authority's 2009 launch article promised the V6 for the 2012 model year, so 2011 is left out; GM Authority's LFX engine page lists the Caprice PPV without years; the 2014 guide prints a standard 3.6L SIDI DOHC V6 VVT with no code

standard; GM Authority's 2016 article, whose own text names the engine (it credits GM's order guides only for the absence of changes); the 2017 order guide prints it (301 hp at 6700 rpm, 265 lb-ft at 4800 rpm) only as contents of 1SB, the one equipment group every car carries (p.4, p.5, p.8, p.14), and in its RPO code index (p.21), so 2017 is not claimed

2015: WT, LT, Z71: O; Base: not offered; standard on crew cab long box models in 2015; LGZ replaces it from 2017

2013: new, replacing the 3.0L V6 (GM Authority's 2013 Equinox page, which prints the official RPO-level changes)

GM Authority's Equinox page gives LFX from 2013 on, and its 2016 Equinox page lists it as the optional engine; neither credits GM for its engine codes; no factory page for these years

1LT, 2LT, LTZ: O; on 1LT it requires UZ8 and UE1; 301 hp (224.4 kW) at 6500 rpm and 272 lb-ft (367.2 N-m) at 4800 rpm

1LT (with PDD and PCY) and Premier (with PCQ and PCY): O, all-wheel drive only (models 1LK26, 1LM26), not with PDR or PDT; the 2016 official changes delete it on the FWD models 1LH26 and 1LJ26

2LT, 2LZ: S; 305 hp; E85 FlexFuel capable with FE9, or with YF5 or NE1 and the NC7 override

available on 1LT in 2017 and required by the LT packages in 2018 (GM's 2017 Impala RPO change list, GM Authority; GM's 2018 Impala RPO change list, GM Authority)