Headlamps, HID xenon projector, adaptive forward lighting

Years 2011 Models 1

Documented applications

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

2011 Confirmed

2011: recoded T4F for 2012 per GM Authority 2012 RPO list

This page aggregates every documented appearance of TT2 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.