Mirror caps, Ebony Twilight

Years 2025–27 Models 1 Factory citations 3

Also documented for Chevrolet

Documented applications

Terrain — Third generation (2025–2027)

2025–2027 Factory-verified

O on all trims; included in, and only available with, 26R or 94T; from 2026 it replaces EWE (on Denali, 94T replaces DP6)

GM factory document — 2025 gmc next generation terrain fleet order guide, p.17.
GM factory document — 2026 gmc next generation terrain fleet order guide, p.23.
GM factory document — 2027 gmc terrain fleet order guide, p.25.

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