- 2023 Factory-verified
4JJ Factory-verified
Also described as Interior trim, Gideon/Very Dark Atmosphere
Also documented for GMC
Documented applications
- 2022–2026 Factory-verified
in the 2022 new-model and LTD, 2023, 2024, 2025 and 2026 Upfitter RPO lists;
- 2022–2023, 2026 Factory-verified
- 2022–2023, 2026 Factory-verified
This page aggregates every documented appearance of 4JJ in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.