- 2019–2020, 2022–2025 Factory-verified
4JJ Factory-verified
Also described as Interior trim, Gideon/Very Dark Atmosphere
Also documented for Chevrolet
Documented applications
- 2022–2023, 2026 Factory-verified
- 2022–2023, 2026 Factory-verified
This page aggregates every documented appearance of 4JJ in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.