CKF ✓ Factory-verified

GMC · Regular Production Option

GVWR, 11,025 lbs (5001 kg)

Years 2025–26 Models 1 Factory citations 4

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2025–2026 ✓ Factory-verified

  only in: 2500 HD; AT4X: O; Pro, SLE, SLT, AT4, 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 CKF in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.