- 2025–2027 Factory-verified
S on all trims; the 2025 and 2026 RPO lists print Battery, 70AH
K4E Factory-verified
Also documented for BuickChevrolet
Documented applications
This page aggregates every documented appearance of K4E in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.