Rear combination lamps, uplevel

Years 2025–27 Models 5 Factory citations 13

Also described as Tail lamps, Exterior Illumination, animated lightingTail lamps, LED illuminationTail lamps, upper, animated walk-up and departure lighting

Also documented for Buick Cadillac Chevrolet

Documented applications

Acadia — Third generation (2024–2027)

2025–2027 Factory-verified

2025: Denali: S; Elevation, AT4: not offered; 2026–2027: Denali, Denali Ultimate: S; Elevation, AT4: not offered

GM factory document — 2025 gmc acadia fleet order guide, p.8.
GM factory document — 2026 gmc acadia fleet order guide, p.8.
GM factory document — 2027 gmc acadia fleet order guide, p.9.

Sierra EV — BT1 (2024–2027)

2027 Factory-verified

GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.10.

Terrain — Third generation (2025–2027)

2026–2027 Factory-verified

S: AT4, Denali; not offered: Elevation; marked new in the 2026 guide

GM factory document — 2026 gmc next generation terrain fleet order guide, p.6.
GM factory document — 2027 gmc terrain fleet order guide, p.7.

Yukon — T1XX (2021–2027)

2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 gmc new yukon denali fleet order guide, p.7.
GM factory document — 2026 gmc yukon denali fleet order guide, p.7.
GM factory document — 2027 gmc yukon fleet order guide, p.7.

Yukon XL — T1XX (2021–2027)

2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.7.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.7.
GM factory document — 2027 gmc yukon xl fleet order guide, p.7.

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