- 2026–2027 Factory-verified
touch-up WA-241L; premium paint (additional charge); 2026: GM Authority gives the same code
G4J Factory-verified
Also documented for CadillacChevroletGMC
Documented applications
This page aggregates every documented appearance of G4J in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.