WLN ✓ Factory-verified

GMC · Regular Production Option

Windows, remote express-up and express-down driver and front passenger, express-down all passengers

Years 2025–27 Models 2 Factory citations 6

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Also described as Windows, remote express-down, front and rear door windows, and express-up front windows

Also documented for Chevrolet

Documented applications

Sierra EV — BT1 (2024–2027) →

• 2025–2027 ✓ Factory-verified

  2025: S in 5SC, 5SD; 2026: S in 4SC, 4SD, 5SB, 5SC, 5SD; not offered in 3SB, 3SC; 2027: S in 4SC, 4SD, 5SC, 5SD; not offered in 3SB, 3SC

  ⛭ GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 gmc sierra ev denali fleet order guide, p.4.

  ⛭ 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.9.

Sierra 1500 — Next-Generation (2027) →

• 2027 ✓ Factory-verified

  Pro, Elevation: not offered; AT4, AT4X, Denali, Denali Ultimate: included in the trim group

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.19.

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

Related codes · mentioned in these notes

3SB3SC4SC4SD5SB5SC5SD

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