OnStar Security service, 6 months added, fleet

Years 2016–19, 2026–27 Models 11 Factory citations 22

Also described as OnStar Connect Plus, 60 monthsOnStar Security service, additional 6 monthsOnStar Connect Plus, 60 months of serviceOnStar Security Service, 6 monthsOnStar Security service, 6 months

Also documented for Cadillac Chevrolet GMC

Documented applications

Cascada — Delta II (2016–2019)

2016–2019 Factory-verified

2016: all trims: O; 2017–2019: 1SP, 1SH: O; requires UE1 and a fleet or government order type

GM factory document — 2016 buick cascada order guide copy gm authority, p.12.
GM factory document — 2017 buick cascada order guide copy gm authority, p.17.
GM factory document — 2018 buick cascada order guide copy gm authority, p.18.
GM factory document — 2019 buick cascada order guide copy gm authority, p.19.

Enclave — C1XX (2018–2024)

2018 Factory-verified

all trims: O; fleet orders; 2018: GM order guide via GM Authority

GM factory document — 2018 buick enclave order guide copy gm authority, p.28, p.37.

Enclave — VSS-S (2025–2027)

2026–2027 Factory-verified

O on all trims; fleet plan

GM factory document — 2026 buick enclave fleet order guide, p.36.
GM factory document — 2027 buick enclave fleet order guide, p.36.

Encore — Gamma II (2013–2022)

2018 Factory-verified

fleet; not on Encore 1SV

GM factory document — 2018 buick encore order guide copy gm authority, p.27.

Encore GX — VSS-F (2020–2027)

2026–2027 Factory-verified

Preferred, Sport Touring, Avenir: O

GM factory document — 2026 buick encore gx fleet order guide, p.41.
GM factory document — 2027 buick encore gx fleet order guide, p.39.

Envision — D2XX, imported from China (2016–2020)

2017–2019 Factory-verified

2019: 1SD, 1SL, 1SN, 1SP: O; fleet or government order types; the 2019 guide limits it to sales through April 30, 2018; 2016 is left out: the 2016 guide prints it only in its RPO code index

GM factory document — 2017 buick envision order guide copy gm authority, p.25.
GM factory document — 2018 buick envision order guide copy gm authority, p.23.
GM factory document — 2019 buick envision order guide copy gm authority, p.30.

Envision — E2XX (2021–2027)

2026–2027 Factory-verified

2027: all trims: 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.31.

Envista — VSS-F (2024–2027)

2026 Factory-verified

all trims: O

GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.30.

LaCrosse — E2XX, 3rd gen (2017–2019)

2018 Factory-verified

2018: Preferred, Essence, Premium: O

GM factory document — 2018 buick lacrosse order guide copy gm authority, p.22.

Regal — E2XX (2018–2020)

2018 Factory-verified

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.1.
GM factory document — 2018 buick regal tourx fleet order guide wayback, p.1.

Regal — Epsilon II, 5th gen (2011–2017)

2016 Factory-verified

2016: 1SL, 1SN, 1SP, 1SX: O; requires UE1 and a fleet or government order type

GM factory document — 2016 buick regal order guide copy gm authority, p.29.

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