Interior trim, Obsidian Rush, full grain leather seats

Years 2023–27 Models 2 Factory citations 8

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Also described as Interior trim, Obsidian Rush, full grain leather

Documented applications

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

AT4X (4SG, 2500 HD only); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.103.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.99.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.93.

Sierra — T1XX (2019–2026)

2023–2026 Factory-verified

AT4X (4SG) in the 2025–2026 guides; the upfitter lists read "Interior trim configuration, leather, level 9, Jet Black/Ceramic White"

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.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide, p.168.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide, p.85.

This page aggregates every documented appearance of H9J in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.