Lamp, dome

Years 1983, 1985–86, 2023–27 Models 3 Factory citations 8

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Also described as Lighting, interior, overhead courtesy lamp

Also documented for Buick Chevrolet Saturn

Documented applications

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

2023–2027 Factory-verified

2025: Elevation: S; AT4, Denali: not offered; 2026–2027: Elevation: S; AT4, AT4X, Denali: not offered

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.10.
GM factory document — 2024 gmc canyon fleet order guide wayback, p.1.
GM factory document — 2025 gmc canyon fleet order guide, p.2.
GM factory document — 2026 gmc canyon fleet order guide, p.3.
GM factory document — 2027 gmc canyon fleet order guide, p.3.

Sierra — Square body (1983–1991)

1985–1986 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; 1984 is left out: its page names C91 only in the YE9 package contents (the 1984 dome lamp line prints ca1); 1987 is left out: its pages name C91 only in package contents, and its dome lamp line prints c91

GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
GM Heritage factory kit — 1986 Chevrolet Truck, p.158.

Sonoma — first generation (1982–1993)

1983 Factory-verified

shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1983 Chevrolet S 10, p.31.

This page aggregates every documented appearance of C91 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.