- 2015–2017, 2019, 2021–2022 Factory-verified
2015–2016: S on all trims; 2021: Elevation Standard: S; Elevation, AT4, Denali: not offered; the 2022 upfitter list marks it do not use on new programs after MY18
AH6 Factory-verified
Also documented for ChevroletPontiac
Documented applications
This page aggregates every documented appearance of AH6 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.