Indicator, trailer information

Years 2019–20, 2022–27 Models 2 Factory citations 8

Query this via API →

Also described as Trailering app

Also documented for Chevrolet

Documented applications

Canyon — Third generation (VSS-T) (2023–2027)

2023–2027 Factory-verified

S on all trims

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.12.
GM factory document — 2024 gmc 24 canyon electrical body builder manual 2023oct04, p.13.
GM factory document — 2025 gmc canyon fleet order guide, p.6.
GM factory document — 2026 gmc canyon fleet order guide, p.7.
GM factory document — 2027 gmc canyon fleet order guide, p.7.

Sierra — T1XX (2019–2026)

2019–2020, 2022 Factory-verified

the Silverado T1XX doc reads "Advanced trailering system"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.13.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.14.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.14.

This page aggregates every documented appearance of U1D in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.