GMC Yukon — T1XX (2021–2027)

GM's own lists for this generation are the GM Upfitter electrical body-builder lists for 2022, 2023 (filed by GM Upfitter for 2023 and 2024, dated 2023 here) and 2026, and the Yukon / Denali fleet order guides for 2025, 2026 and 2027, whose trim availability is given in Notes (O optional, S standard or included in the trim's equipment group). The body-builder lists cover the Yukon and the Yukon XL together, so the Yukon XL doc reads the same three lists; the fleet order guides used here are the Yukon guides only, the Yukon XL has its own guides, and ABV, ACS, AHX, AJV, AL4, C6C, KUF and UQH (and 02N for 2026) are printed in the Yukon guides but not in the XL ones. The guides name the Elevation, AT4, AT4 Ultimate, Denali and Denali Ultimate trims, the 2022 list names SLE, SLT, AT4 and Denali trim packages and the 2023 list adds Denali Ultimate, and the Arlington, Texas plant code (ARL) appears in all three body-builder lists. No list in the archive covers 2021 or 2024, so a year missing from the Years column means no source was read for it; NICB's 2021 and 2026 VIN manuals show the Yukon trims for those years.

Codes

Engines

Transmissions

Axles

Packages & Trims

Equipment

Paint

Interior Trim

Internal / Process

Sources

Factory documents (T1)

• gmc/2022-gmc-22-yukon-yukon-xl-electrical-body-builder-sm-u-2021oct13.txt — GMC Yukon and Yukon XL ELECTRICAL Section (GM Upfitter), RPO code list pp.9-14 — https://www.gmupfitter.com/wp-content/uploads/2021/10/22_Yukon_Yukon_XL_Electrical_Body_Builder_SM_U_2021OCT13.pdf
• gmc/2023-gmc-23-yukon-yukon-xl-electrical-body-builder-sm-en-us-092822.txt — GMC Yukon and Yukon XL ELECTRICAL Section (listed for model years 2023, 2024) (GM Upfitter), RPO code list pp.9-14 — https://www.gmupfitter.com/wp-content/uploads/2022/09/23_Yukon_Yukon_XL_Electrical_Body_Builder_SM_en_US_092822.pdf
• gmc/2025-gmc-new-yukon-denali-fleet-order-guide.txt — 2025 GMC New Yukon / Denali — GM Fleet Order Guide (Print All) — https://www.gmfleetorderguide.com/brand-list/brand/2ad71e24-e58f-4c4d-a693-d6036d0a272e/vehicle/22894/model-home
• gmc/2026-gmc-yukon-denali-fleet-order-guide.txt — 2026 GMC Yukon / Denali — GM Fleet Order Guide (Print All) — https://www.gmfleetorderguide.com/brand-list/brand/2ad71e24-e58f-4c4d-a693-d6036d0a272e/vehicle/23244/model-home
• gmc/2026-gmc-yukon-yukon-xl-electrical-body-builder-manual-service-manual-2026-en-us.txt — GMC Yukon and Yukon XL ELECTRICAL Section (GM Upfitter), RPO code list pp.4-11 — https://www.gmupfitter.com/wp-content/uploads/2025/09/Yukon-Yukon-XL-Electrical-Body-Builder-Manual-Service-Manual-2026_en_US.pdf
• gmc/2027-gmc-yukon-fleet-order-guide.txt — 2027 GMC Yukon — GM Fleet Order Guide (Print All) — https://www.gmfleetorderguide.com/brand-list/brand/2ad71e24-e58f-4c4d-a693-d6036d0a272e/vehicle/23380/model-home

The RPO Codes dialogs captured with each fleet order guide (the …-fleet-order-guide-rpo-codes.txt files) and the Print All guides' own RPO CODES pages list the same codes; the Print All guides were cited because they also give trim availability and the COLOR AND TRIM pages.

Other sources

• NICB VIN manual 2021, GM section, pp.175-176 (docs/reference/nicb/nicb2021-gm.txt) — Yukon trim VIN codes for 2021 (SLE, SLT, AT4, Denali), context only
• NICB VIN manual 2026, GM section, pp.156-157 (docs/reference/nicb/nicb2026-gm.txt) — Yukon trim VIN codes for 2025 and 2026 (Elevation, AT4, AT4 Ultimate, Denali, Denali Ultimate), context only
• No web pages were fetched for this doc (2026-10-08); GM Authority was not used, so every row rests on the factory documents above.