Trim package, Denali Ultimate

Years 2023–26 Models 4 Factory citations 8

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Also described as Denali Reserve Package

Documented applications

Acadia — Third generation (2024–2027)

2025 Factory-verified

Denali: O; Elevation, AT4: not offered; 2025 only; includes CAJ, FE4, RUJ, QZR and UQP; PDR is the later Denali Reserve code

GM factory document — 2025 gmc acadia fleet order guide, p.14.

Sierra — T1XX (2019–2026)

2023–2025 Factory-verified

GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.11.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.13.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.11.

Yukon — T1XX (2021–2027)

2023, 2026 Factory-verified

GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.10.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.6.

Yukon XL — T1XX (2021–2027)

2023, 2026 Factory-verified

GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.10.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.6.

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