OnStar One, 3 years

Years 2025–27 Models 4 Factory citations 10

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Also documented for Cadillac Chevrolet GMC

Documented applications

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

2025: O on all trims; 2026–2027: Preferred, Sport Touring: O; Avenir: not offered; the 2027 guide adds "Standalone"; not available with R9M or UKL; after the 3 years a paid OnStar plan is required

GM factory document — 2025 buick all new enclave fleet order guide, p.11.
GM factory document — 2026 buick enclave fleet order guide, p.11.
GM factory document — 2027 buick enclave fleet order guide, p.12.

Encore GX — VSS-F (2020–2027)

2026–2027 Factory-verified

Preferred, Sport Touring: O

GM factory document — 2026 buick encore gx fleet order guide, p.12.
GM factory document — 2027 buick encore gx fleet order guide, p.12.

Envision — E2XX (2021–2027)

2026–2027 Factory-verified

2027: Preferred, Sport Touring: O

GM factory document — 2026 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide, p.11.

Envista — VSS-F (2024–2027)

2026 Factory-verified

Preferred, Sport Touring: O; requires OnStar and a TRE or SRE order type

GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.9.

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