DLN Factory-verified

GMC · Regular Production Option

Mirrors, outside, heated power-adjustable, manual folding

Years 2025–27 Models 1 Factory citations 6

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD and 3500 HD pickup; smaller non-trailer mirror with flat (not convex) passenger glass; GM Authority lists the code as DLF changing to DLN for 2022; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered

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.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.32.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.29.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.30.

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