OnStar One, 3 years

2LT, 3LT, RS: O; Premier: O (2025 only)

only in: Blazer EV, not the Police Package; the 2027 guide reads 3 Years OnStar One (Standalone)

LT, RS: O; requires UE1 and a retail order type; not available with UKL or R9M

2025: LT, Trail Boss, Z71, ZR2: O; WT: not offered; 2026–2027: O on all trims

the 2027 list prints "(Standalone)"

the 2027 guide prints "(Standalone)"; 2025: A in all trims (requires UE1; not available with R9M or UKL); 2026–2027: A in all trims (requires UE1; not available with UKL or R9M)

O on all trims; retail standalone plan; requires UE1 and a TRE or SRE order type in 2025 and 2026 (a retail order type in 2027); not available with fleet or government order types (2025, 2026) or on shipments to Puerto Rico, the Virgin Islands or Guam; the 2027 guide adds Standalone to the name

all trims: O; requires UE1 and a TRE or SRE order type; not available with fleet or government order types or on shipments to Puerto Rico, the Virgin Islands or Guam; added to the guide on May 5, 2025

the 2027 list prints "(Standalone)"; 2025: A in 3LT; not offered in 2WT, 5WT, 8WT, 2SP, 3SP; 2026: A in 4WT, 5WT, 8WT, 2LT, 3LT, 2TR; not offered in 4LT, 3TR, 2SP, 3SP; 2027: A in 4WT, 5WT, 8WT, 2LT, 3LT, 2TR; not offered in 3TR; 2025: not available with R9M or UKL

the list prints "(Standalone)"

the 2027 lists add "(Standalone)"

2027: O on all trims; the 2027 guide adds "Standalone"

2027: LS, LT, RST, Z71, Premier, High Country: O; the 2027 guide adds "Standalone"

all trims: O; requires UE1 and a TRE or SRE order type; the 2027 guide reads 3 Years OnStar One (Standalone)

LT, Z71: O; High Country, RS: not offered; the 2027 guide adds (Standalone) to the wording; TRE or SRE order types only, not fleet or government

all trims: O; needs OnStar (UE1) and order type TRE or SRE; not for fleet or government orders