RGM ✓ Factory-verified

GMC · Regular Production Option

AT4 Premium Package

Years 2025–27 Models 2 Factory citations 6

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Documented applications

Yukon — T1XX (2021–2027) →

• 2025–2027 ✓ Factory-verified

  2027: AT4: O; includes UKL, CWM, C3U

  ⛭ GM factory document — 2025 gmc new yukon denali fleet order guide, p.21.

  ⛭ GM factory document — 2026 gmc yukon denali fleet order guide, p.22.

  ⛭ GM factory document — 2027 gmc yukon fleet order guide, p.20.

Yukon XL — T1XX (2021–2027) →

• 2025–2027 ✓ Factory-verified

  2027: AT4: O; includes UKL, CWM, C3U

  ⛭ GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.21.

  ⛭ GM factory document — 2026 gmc yukon xl denali fleet order guide, p.22.

  ⛭ GM factory document — 2027 gmc yukon xl fleet order guide, p.20.

Related codes · mentioned in these notes

C3UCWMUKL

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