- 2025–2027 Factory-verified
S: Denali (from 2026); O: Elevation, AT4 (from 2026); included in, and only available with, ZL4
KU3 Factory-verified
Also documented for BuickCadillacChevrolet
Documented applications
This page aggregates every documented appearance of KU3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.