- 2023 Factory-verified
4JS Factory-verified
Documented applications
- 2022–2026 Factory-verified
in the 2022 new-model and LTD, 2023, 2024, 2025 and 2026 Upfitter RPO lists;
This page aggregates every documented appearance of 4JS in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.