GA4 ✓ Factory-verified

GMC · Regular Production Option

Trim package, AT4X

Years 2023–25 Models 1 Factory citations 3

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Documented applications

Sierra — T1XX (2019–2026) →

• 2023–2025 ✓ Factory-verified

  the lists print "AT4 X"

  ⛭ GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.11.

  ⛭ GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.13.

  ⛭ GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.11.

This page aggregates every documented appearance of GA4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.