OnStar Protection service, 30 months added, fleet

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

Also described as OnStar Connect Plus, 48 monthsOnStar Protection service, additional 30 monthsOnStar Connect Plus, 48 months of serviceOnStar Protection Service, 30 monthsOnStar Protection service, 30 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.18.

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.27, 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.35.
GM factory document — 2027 buick enclave fleet order guide, p.35.

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.26.

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.29.

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 PQH in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.