Alternator, 120 amps

Years 2012–13, 2015 Models 2 Factory citations 1

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Also documented for Chevrolet

Documented applications

LaCrosse — Epsilon II, 2nd gen (2010–2016)

2012, 2015 Factory-verified

2015: 1SB, 1SL FWD: S; with LUK; 2012: GM Authority 2012 RPO list

GM factory document — 2015 buick lacrosse fleet order guide wayback, p.4.

Regal — Epsilon II, 5th gen (2011–2017)

2012 Confirmed

2016 is left out: the 2016 guide sells it only inside LUK (p.23, p.25); new for 2012, with LUK (GM's 2012 list)
2013 Single-source

standard on the 4GR69 models (GM Authority 2013 changes); single-source: GM Authority 2013 changes does not credit GM

This page aggregates every documented appearance of KY2 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.