B3L ✓ Factory-verified

GMC · Regular Production Option

Assist steps, power-retractable, with lighting

Years 2022–23, 2025–27 Models 4 Factory citations 15

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Also described as Assist steps, GMC MultiPro power steps, power retractable, rearward articulatingAssist steps, power retractable, black, with LED lighting

Also documented for CadillacChevrolet

Documented applications

Sierra 1500 — Next-Generation (2027) →

• 2027 ✓ Factory-verified

  Pro, Elevation, AT4, AT4X: not offered; Denali: O; Denali Ultimate: included in the trim group; provides bed access; foot-activated running board

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.17.

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — T1XX (2020–2027) →

• 2025–2027 ✓ Factory-verified

  only in: 2500 HD and 3500 HD pickup

  ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Yukon — T1XX (2021–2027) →

• 2022–2023, 2025–2027 ✓ Factory-verified

  2027: AT4 Ultimate, Denali Ultimate: S; AT4, Denali: O

  ⛭ GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.10.

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

  ⛭ GM factory document — 2025 gmc new yukon denali fleet order guide, p.14.

  ⛭ GM factory document — 2026 gmc yukon denali fleet order guide, p.16.

  ⛭ GM factory document — 2027 gmc yukon fleet order guide, p.14.

Yukon XL — T1XX (2021–2027) →

• 2022–2023, 2025–2027 ✓ Factory-verified

  2027: AT4 Ultimate, Denali Ultimate: S; AT4, Denali: O

  ⛭ GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.10.

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

  ⛭ GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.15.

  ⛭ GM factory document — 2026 gmc yukon xl denali fleet order guide, p.16.

  ⛭ GM factory document — 2027 gmc yukon xl fleet order guide, p.14.

This page aggregates every documented appearance of B3L in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.