Lamp, CHMSL, center high mount stop light (see BFO before using)

Years 2023–27 Models 2 Factory citations 7

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Also described as Cargo lamps, located within cab-mounted cargo light

Also documented for Chevrolet

Documented applications

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

2023–2024, 2026 Factory-verified

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 — 2026 gmc canyon electrical body builder manual service manual 2026 en us, p.8.

Sierra EV — BT1 (2024–2027)

2025–2027 Factory-verified

the 2025 guide prints "Lamps, cargo center high mount stop lamp"; 2026 and 2027: included with and only available with CWM; 2025: S in 5SC, 5SD; 2026: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB, 5SB; 2027: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB

GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra ev denali fleet order guide, p.5.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.9.

This page aggregates every documented appearance of T3V in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.