- 2021–2022 Factory-verified
the 2021 guide names it in its notes (it brings K4C on the AT4); the upfitter list reads level 2
HVD Factory-verified
Also described as Interior trim, leather-appointed, Jet Black and KalahariInterior trim, leather, level 2, Jet Black/Kalahari
Documented applications
- 2025–2027 Factory-verified
AT4 (4SB); bucket seats A50; the name matches the GM Authority 2026 Sierra HD interior colors page
- 2019–2020, 2022–2026 Factory-verified
the 2025–2026 guides: Jet Black with Kalahari accents, perforated front leather, AT4 (4SB)
This page aggregates every documented appearance of HVD in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.