- 2025–2027 Factory-verified
2025: Elevation: O; AT4, Denali: not offered; 2026–2027: Elevation, AT4: O; Denali, Denali Ultimate: not offered; the 2027 guide adds Standalone
PRB Factory-verified
Also described as OnStar One standalone, 3 years
Also documented for BuickCadillacChevrolet
Documented applications
- 2025–2027 Factory-verified
2025: Elevation: O; AT4, Denali: not offered; 2026–2027: Elevation, AT4, AT4X: O; Denali: not offered; the 2027 list adds (Standalone)
- 2026–2027 Factory-verified
the 2027 guide prints "(Standalone)" and requires UE1 and a retail order type; the 2026 guide requires UE1 and order type TRE or SRE; 2026: A in 3SB, 3SC; not offered in 4SC, 4SD, 5SB, 5SC, 5SD; 2027: A in 3SB, 3SC; not offered in 4SC, 4SD, 5SC, 5SD
- 2027 Factory-verified
Pro, Elevation: O; AT4, AT4X, Denali, Denali Ultimate: not offered; requires OnStar (UE1) and a retail order type; on Elevation 3SB not available with Super Cruise (UKL) or R9M
- 2025–2027 Factory-verified
the 2027 lists print "3 Years OnStar One (Standalone)"; requires order type TRE or SRE
- 2026 Factory-verified
- 2025–2027 Factory-verified
2025: O on all trims; 2026: O: Elevation; not offered: AT4, Denali; 2027: O: Elevation, AT4; not offered: Denali; retail standalone plan (requires a TRE or SRE order type in 2025 and 2026, a retail order type in 2027); the 2027 guide adds Standalone to the name
- 2025–2027 Factory-verified
2027: Elevation, AT4: O; the 2027 guide adds "Standalone"
- 2025–2027 Factory-verified
2027: Elevation, AT4: O; the 2027 guide adds "Standalone"
This page aggregates every documented appearance of PRB in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.