- 2025–2026 Factory-verified
touch-up WA-225K; additional charge; the 2026 upfitter list names it Reef Met-1 (225K)
GAL Factory-verified
Also documented for Chevrolet
Documented applications
- 2025–2027 Factory-verified
touch-up WA-225K; additional charge; from 2026 only on Elevation and AT4; marked new in the 2025 guide
This page aggregates every documented appearance of GAL in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.