- 2016 Factory-verified
touch-up WA-378A; printed as new; not at start of production; deleted for 2017 (GM's 2017 Impala RPO change list, GM Authority)
GA1 Factory-verified
Documented applications
- 2017 Factory-verified
touch-up WA-378A; printed as new; promotional color, limited availability; Jet Black interior only; the capture marks it no longer available to order; new for 2017 and deleted for 2018 (GM Authority's 2017 and 2018 RPO lists)
This page aggregates every documented appearance of GA1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.