GXP Factory-verified

GMC · Regular Production Option

Paint, Downpour Metallic

Years 2024–27 Models 7 Factory citations 19

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Also described as Downpour Metallic (touch-up WA-136H)

Also documented for Buick Cadillac Chevrolet

Documented applications

Acadia — Third generation (2024–2027)

2025–2026 Factory-verified

touch-up WA-136H; additional charge; only on Denali in 2025 and on Denali and Denali Ultimate in 2026

GM factory document — 2025 gmc acadia fleet order guide, p.45.
GM factory document — 2026 gmc acadia fleet order guide, p.44.

Sierra HD — T1XX (2020–2027)

2024–2027 Factory-verified

2024: GM Authority 2024 changes page; touch-up WA-136H

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.102.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.98.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.92.

Sierra — T1XX (2019–2026)

2024–2026 Factory-verified

touch-up WA-136H; the upfitter lists name it Cosmonaut Metallic

GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.13.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.11.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide, p.167, p.169.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide, p.84, p.86.

Terrain — Second generation (D2XX) (2018–2024)

2024 Single-source

new for 2024 (GM Authority 2024 changes page; GM Authority 2024 paint-loss article)

Terrain — Third generation (2025–2027)

2026–2027 Factory-verified

touch-up WA-136H; additional charge; only on Denali

GM factory document — 2026 gmc next generation terrain fleet order guide, p.29.
GM factory document — 2027 gmc terrain fleet order guide, p.30.

Yukon — T1XX (2021–2027)

2025–2027 Factory-verified

the 2026 body-builder list reads Cosmonaut Met-1

GM factory document — 2025 gmc new yukon denali fleet order guide, p.79.
GM factory document — 2026 gmc yukon denali fleet order guide, p.86.
GM factory document — 2027 gmc yukon fleet order guide, p.75.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.6.

Yukon XL — T1XX (2021–2027)

2025–2027 Factory-verified

the 2026 body-builder list reads Cosmonaut Met-1

GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.85.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.86.
GM factory document — 2027 gmc yukon xl fleet order guide, p.77.
GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.6.

This page aggregates every documented appearance of GXP in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.