- 2023–2027 Factory-verified
SBY Factory-verified
Also documented for Chevrolet
Documented applications
- 2019–2020, 2022–2026 Factory-verified
the upfitter lists read "design 1"
This page aggregates every documented appearance of SBY in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.