- 2017–2018 Factory-verified
extra cost; new for 2017 with late availability; deleted for 2019 (GM's official 2019 change list as printed on GM Authority's 2019 changes page); 2018 from GM's 2018 order guide
GP9 Factory-verified
Documented applications
This page aggregates every documented appearance of GP9 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.