Lighting, perimeter

Years 2019–20, 2022–27 Models 2 Factory citations 10

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Also documented for Chevrolet Pontiac

Documented applications

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation 3SB: O; Elevation 3VL: 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.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

the upfitter lists read "Lamp, exterior, outside rearview mirror, task"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.13.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.14.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.14.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.14.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.16.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.14.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of U12 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.