SiriusXM, additional 9 months of the SXM Platinum Plan

Years 2025–27 Models 10 Factory citations 28

Also described as API Elite, 24 monthsSiriusXM Platinum Plan, 9 extra monthsAPI Elite plan, 24 months (fleet)SiriusXM, additional 9 months, SXM Platinum Plan

Also documented for Buick Chevrolet GMC

Documented applications

CT4 — Alpha 2 (2020–2026)

2025 Factory-verified

O on all trims; fleet and government order types; 2026 gives the code another meaning (API Elite, 24 months)

GM factory document — 2025 cadillac ct4 fleet order guide, p.40.
2026 Factory-verified

O on all trims; fleet telematics data plan; another meaning than 2025 (SiriusXM, additional 9 months)

GM factory document — 2026 cadillac ct4 fleet order guide, p.46.

CT5 — Alpha 2 (2020–2026)

Escalade IQ — Ultium BEV (2025–2027)

Escalade — T1XX, 5th gen (2021–2027)

2025 Factory-verified

2025: O on all trims; the code means an API Elite plan from 2026

GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.50.
2026–2027 Factory-verified

2027: O on all trims; in 2025 the code meant 9 extra SiriusXM months

GM factory document — 2026 cadillac escalade escalade v fleet order guide, p.60.
GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.79.

Lyriq — BEV3 (2023–2027)

2025 Factory-verified

the 2026 and 2027 lists give PR6 another meaning (second PR6 row); PR7 and PR8 add 21 and 33 months

GM factory document — 2025 cadillac all electric lyriq fleet order guide rpo codes, p.1.
2026–2027 Factory-verified

the 2025 list gives PR6 another meaning (first PR6 row)

GM factory document — 2026 cadillac all electric lyriq lyriq v 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 Factory-verified

SiriusXM subscription code; the code means an API Elite plan in 2026–2027

GM factory document — 2025 cadillac all electric optiq fleet order guide rpo codes, p.1.
2026–2027 Factory-verified

the code means a SiriusXM extension in 2025

GM factory document — 2026 cadillac all electric optiq optiq v 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.55.
GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.55.

XT4 — E2 (2019–2025)

2025 Factory-verified

Premium Luxury, Sport: O; requires U2K; fleet or government order types only

GM factory document — 2025 cadillac xt4 fleet order guide, p.36.
GM factory document — 2025 cadillac xt4 fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026)

2025 Factory-verified

GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac xt5 fleet order guide, p.53.
2026 Factory-verified

all trims: O

GM factory document — 2026 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac xt5 fleet order guide, p.70.

XT6 — C1XX (2020–2025)

2025 Factory-verified

All trims: O

GM factory document — 2025 cadillac xt6 fleet order guide, p.55.
GM factory document — 2025 cadillac xt6 fleet order guide, p.63.

This page aggregates every documented appearance of PR6 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.