DUD ✓ Factory-verified

GMC · Regular Production Option

Mirrors, outside, high-visibility vertical trailering, lower convex mirrors, manual folding and extending (extends 3.31 inch [84.25 mm]), molded in black

Years 2025–27 Models 1 Factory citations 3

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2025–2027 ✓ Factory-verified
  ⛭ 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.

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