CKM ✓ Factory-verified

GMC · Regular Production Option

GVWR, 10,960 lbs (4971 kg)

Years 2025–26 Models 1 Factory citations 4

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Documented applications

Sierra HD — T1XX (2020–2027) →

• 2025–2026 ✓ Factory-verified

  only in: 2500 HD; 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 — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.94.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.90.

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