KHF ✓ Factory-verified

GMC · Regular Production Option

Alternators, dual, 220 amps primary, 170 amps auxiliary

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

  with the gasoline V8, the auxiliary battery (K4Z) is required; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O

  ⛭ 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.42.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.40.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.40.

Related codes · mentioned in these notes

K4Z

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