- 2022–2023 Factory-verified
all trims: O; fleet orders
P0K Factory-verified
Also described as OnStar Protect, 36 monthsOnStar Fleet Safety and Security, additional 33 monthsOnStar Protect, 36 months of service
Also documented for CadillacChevroletGMC
Documented applications
- 2025–2027 Factory-verified
O on all trims; fleet plan; the 2025 guide names it OnStar Security
- 2019 Factory-verified
fleet orders; not on Encore 1SV; new for 2019
- 2025–2027 Factory-verified
Preferred, Sport Touring, Avenir: O; the 2025 guide names the plan OnStar Security
- 2019 Factory-verified
1SD, 1SL, 1SN, 1SP: O; fleet or government order types; for sales from May 1, 2018
- 2025–2027 Factory-verified
2027: all trims: O; the 2025 list reads OnStar Security - 36 Months of Service; the 2026–2027 lists name the plan differently
- 2025–2026 Factory-verified
all trims: O; the 2025 list calls it OnStar Security, 36 months of service
- 2019 Factory-verified
2019: Preferred, Sport Touring, Essence, Premium, Avenir: O; the 2019 guide's fleet-options page prints POK, its option-code index P0K
- 2019 Factory-verified
2019: Preferred, Preferred II, Essence, Avenir, GS: O (2019 Sportback order guide); new for 2019; the guide prints POK with a letter O; fleet orders
This page aggregates every documented appearance of P0K in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.