P0K Factory-verified

GMC · Regular Production Option

OnStar Protect, 36 months

Years 2019, 2025–27 Models 11 Factory citations 36

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Also described as OnStar Fleet Safety and Security, additional 33 monthsOnStar Protect plan, 36 months (fleet)

Also documented for Buick Cadillac Chevrolet

Documented applications

Acadia — Second generation (C1XX) (2017–2023)

2019 Factory-verified

SLE-1, SLE-2, SLT-1, SLT-2, Denali: O; adds to the 3 months included

GM factory document — 2019 gmc acadia order guide copy gm authority, p.41.

Acadia — Third generation (2024–2027)

2025–2027 Factory-verified

O on all trims; fleet and government order types; the 2025 list names it OnStar Security

GM factory document — 2025 gmc acadia fleet order guide, p.48.
GM factory document — 2026 gmc acadia fleet order guide, p.46.
GM factory document — 2027 gmc acadia fleet order guide, p.49.

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

2025–2027 Factory-verified

O on all trims; the 2025 list names it OnStar Security

GM factory document — 2025 gmc canyon fleet order guide, p.49.
GM factory document — 2026 gmc canyon fleet order guide, p.66.
GM factory document — 2027 gmc canyon fleet order guide, p.67.

Savana — GMT610 (2003–2027)

2025–2027 Factory-verified

the 2025 guides name it OnStar Security, 36 months of service; O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2025 gmc savana cargo fleet order guide, p.44.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.56.
GM factory document — 2025 gmc savana passenger fleet order guide, p.34.
GM factory document — 2026 gmc savana cargo fleet order guide, p.45.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.59.
GM factory document — 2026 gmc savana passenger fleet order guide, p.35.
GM factory document — 2027 gmc savana cargo fleet order guide, p.42.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.31.
GM factory document — 2027 gmc savana passenger fleet order guide, p.34.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

all trims: O

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.114.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

the 2025 lists name it OnStar Security; Pro, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate: O

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.116.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.111.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.105.

Sierra — T1XX (2019–2026)

2025–2026 Factory-verified

the 2025 list names it OnStar Security

GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

all trims: O; fleet orders; new for 2019

GM factory document — 2019 gmc terrain order guide copy gm authority, p.48.

Terrain — Third generation (2025–2027)

2025–2027 Factory-verified

O on all trims; fleet and government order types; the 2025 list names it OnStar Security

GM factory document — 2025 gmc next generation terrain fleet order guide, p.23.
GM factory document — 2026 gmc next generation terrain fleet order guide, p.31.
GM factory document — 2027 gmc terrain fleet order guide, p.32.

Yukon — T1XX (2021–2027)

2025–2027 Factory-verified

2027: O on all trims; the 2025 guide reads OnStar Security, 36 months of service

GM factory document — 2025 gmc new yukon denali fleet order guide, p.82.
GM factory document — 2026 gmc yukon denali fleet order guide, p.89.
GM factory document — 2027 gmc yukon fleet order guide, p.78.

Yukon XL — T1XX (2021–2027)

2025–2027 Factory-verified

2027: O on all trims; the 2025 guide reads OnStar Security, 36 months of service

GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.88.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.89.
GM factory document — 2027 gmc yukon xl fleet order guide, p.80.

This page aggregates every documented appearance of P0K in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.