R8P Factory-verified

Cadillac · Regular Production Option

OnStar One Fleet, 36 months

Years 2025–27 Models 10 Factory citations 27

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Also described as OnStar One Fleet plan, 36 monthsOnStar One Business Plus, 36 months of service

Also documented for Buick Chevrolet GMC

Documented applications

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

all trims: O; the 2025 lists call it OnStar One Business Plus

GM factory document — 2025 cadillac ct4 fleet order guide, p.39.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.41.
GM factory document — 2026 cadillac ct4 fleet order guide, p.34.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.35.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

the 2025 list reads OnStar One Business Plus

GM factory document — 2025 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

Escalade IQ — Ultium BEV (2025–2027)

2025–2027 Factory-verified

the 2025 list words it as OnStar One Business Plus, 36 months of service; 2027 guide: all trims: O

GM factory document — 2025 cadillac all electric escalade iq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric escalade iql fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric escalade iql fleet order guide, p.45.

Escalade — T1XX, 5th gen (2021–2027)

2025–2027 Factory-verified

2027: O on all trims; 2025: OnStar One Business Plus

GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.49.
GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.57.

Lyriq — BEV3 (2023–2027)

2025–2027 Factory-verified

the 2025 list reads OnStar One Business Plus

GM factory document — 2025 cadillac all electric lyriq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric lyriq lyriq v fleet order guide rpo codes, p.1.

Optiq — BEV3 (2025–2027)

2025–2027 Factory-verified

the 2025 list reads "OnStar One Business Plus 36 months of service"

GM factory document — 2025 cadillac all electric optiq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric optiq optiq v fleet order guide rpo codes, p.1.

Vistiq — BEV3 (2026–2027)

2026–2027 Factory-verified

GM factory document — 2026 cadillac all electric vistiq fleet order guide, p.56.
GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.56.

XT4 — E2 (2019–2025)

2025 Factory-verified

Premium Luxury, Sport: O; requires UE1; US fleet or government order types only

GM factory document — 2025 cadillac xt4 fleet order guide, p.35.
GM factory document — 2025 cadillac xt4 fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

all trims: O; 2025 list prints "OnStar One Business Plus - 36 Months of Service"

GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac xt5 fleet order guide, p.51.
GM factory document — 2026 cadillac xt5 fleet order guide, p.43.

XT6 — C1XX (2020–2025)

2025 Factory-verified

All trims: O

GM factory document — 2025 cadillac xt6 fleet order guide, p.53.
GM factory document — 2025 cadillac xt6 fleet order guide, p.64.

This page aggregates every documented appearance of R8P in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.