- 2023–2027 Factory-verified
only in: AT4X (2025: AT4X Package XEW on AT4); seat code A50, front buckets; the upfitter lists read leather, level 3.1, Jet Black / Ceramic White
HV1 Factory-verified
Also documented for Chevrolet
Documented applications
This page aggregates every documented appearance of HV1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.