K4Z ✓ Factory-verified

GMC · Regular Production Option

Battery, auxiliary, 700 cold-cranking amps/70 amp-hr

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

  Pro, SLE, SLT, AT4, AT4X, Denali: O; 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.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.

This page aggregates every documented appearance of K4Z in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.