RG4 ✓ Factory-verified

GMC · Regular Production Option

Fleet Delete Base Content Package

Years 2025–26 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Sierra — T1XX (2019–2026) →

• 2025–2026 ✓ Factory-verified
  ⛭ GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of RG4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.