- 2025 Factory-verified
touch-up WA-135H; additional charge; only on AT4
GXN Factory-verified
Also described as Paint, Deep Aurora Metallic (Dark Bronze)
Also documented for Chevrolet
Documented applications
- 2023–2025 Factory-verified
touch-up WA-135H; additional charge; the upfitter lists read Retrograde Met-1 (135H)
- 2025–2026 Factory-verified
additional charge; touch-up WA-135H
- 2025–2026 Factory-verified
extra charge; touch-up WA-135H. GM Authority lists the paint code (checked 2026-10-07).
- 2026 Factory-verified
additional charge; built out for the model year; not available on Denali; not offered with the Desert Dune interior; touch-up WA-135H
- 2023–2024 Factory-verified
touch-up 135H; the upfitter lists read Retrograde Metallic
This page aggregates every documented appearance of GXN in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.