CT4 — Alpha 2 (2020–2026)

V-Series: S; Premium Luxury: O; the CT4 guides print 310 hp and the CT4-V guides 325 hp; 2024 from GM Authority's 2024 CT4 specifications (RPO LSY and L3B listed)

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

only in: CT4; all trims: S; 2024 from GM Authority's 2024 CT4 specifications (RPO LSY and L3B listed)

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S; V-Series Blackwing only; the guides pair it with an upgrade to the 10 speed automatic MHU

only in: CT4; all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O; V-Series Blackwing option; requires the Driver Assist Package Y5Y in the guides

V-Series: S; Premium Luxury: O; in the CT4 guides an upgrade from the 8 speed automatic MHA when the 2.7L L3B is ordered

Luxury, Premium Luxury, Sport, V-Series: O

only in: CT4-V and CT4-V Blackwing; V-Series: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O; on the V-Series Blackwing the guides include it only with the 10 speed automatic MHU

all trims: S

CT4 Luxury; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Premium Luxury; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Sport; 2020 from GM Authority's 2020 CT4 interior colors page

CT4-V V-Series; 2020 from GM Authority's 2020 CT4 interior colors page

CT4-V Blackwing

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

Premium Luxury, Sport, V-Series, V-Series Blackwing: O; GM says it upgrades the gauge cluster (UDV) and adds the head-up display (UV6)

V-Series Blackwing: S; Premium Luxury, Sport, V-Series: O; GM includes UGC and T87

only in: CT4; Luxury: O

only in: CT4

only in: CT4

Premium Luxury, Sport, V-Series: O; adds Super Cruise (UKL), which replaces UHX

2025: V-Series Blackwing: S; Luxury, Sport, V-Series: O; 2026: Luxury, V-Series Blackwing: S; GM includes heated seats (KA1) and a heated steering wheel (KI3) in the CT4 guides

V-Series Blackwing: S; Luxury, Premium Luxury, Sport, V-Series: O; the CT4 lists name it Navigation and Bose Premium Audio Package; the CT4-V lists read Navigation Package

all trims: S; GM includes UE4, UHX, UKC, UFG and TQ5

Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O; GM includes KSG, UGN and UVZ

2025: Premium Luxury, Sport, V-Series, V-Series Blackwing: O; 2026: Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O; the CT4 guides include heated and ventilated seats (KA1, KU9) and a heated steering wheel (KI3)

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O; GM links it to Magnus Metal Frost paint and the Sky Cool Gray with Santorini Blue and Jet Black with Phantom Blue interiors in the 2025 guide

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

only in: CT4; Premium Luxury: S

all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

only in: CT4

only in: CT4

only in: CT4-V and CT4-V Blackwing; all trims: O

all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

all trims: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

only in: CT4; Luxury: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

all trims: S

2025: Sport, V-Series, V-Series Blackwing: O; 2026: Sport, V-Series: S; V-Series Blackwing: O

2025: Sport: S; V-Series, V-Series Blackwing: O; 2026: Sport, V-Series: S; V-Series Blackwing: O

Sport, V-Series, V-Series Blackwing: S

2025: Sport: S; V-Series, V-Series Blackwing: O; 2026: Sport, V-Series: S; V-Series Blackwing: O

Sport, V-Series, V-Series Blackwing: S

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

all trims: S

2025: Sport, V-Series, V-Series Blackwing: O; 2026: Sport, V-Series: S; V-Series Blackwing: O

all trims: S

only in: CT4; 2025: Luxury, Premium Luxury: S; 2026: Luxury: S

all trims: S

all trims: S; 2020 from GM Authority's 2020 CT4 interior colors page

only in: CT4-V and CT4-V Blackwing; 2025: all trims: O; 2026: V-Series Blackwing: O

all trims: S

only in: CT4; Premium Luxury: S

all trims: S

2025: Sport, V-Series, V-Series Blackwing: S; Premium Luxury: O; 2026: Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

2025: Sport, V-Series, V-Series Blackwing: S; Premium Luxury: O; 2026: Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

all trims: S

only in: CT4; all trims: S

all trims: S; the CT4-V lists print it as deluxe carpeted rear

only in: CT4-V and CT4-V Blackwing; all trims: S

only in: CT4-V and CT4-V Blackwing; all trims: S

only in: CT4; Luxury, Premium Luxury: S

Sport, V-Series: S; V-Series Blackwing: O; the CT4-V lists print it without "body-color"

only in: CT4; Luxury, Premium Luxury: S

Sport, V-Series, V-Series Blackwing: S

only in: CT4-V and CT4-V Blackwing; 2025: all trims: O; 2026: V-Series Blackwing: S

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

only in: CT4; all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

all trims: S

Sport, V-Series, V-Series Blackwing: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: O

all trims: S

only in: CT4; Luxury: S

Sport, V-Series, V-Series Blackwing: S

Sport, V-Series, V-Series Blackwing: S

only in: CT4; Luxury, Premium Luxury: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

only in: CT4; Luxury: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

all trims: S

only in: CT4

V-Series: S; Premium Luxury, V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; all trims: S

only in: CT4; all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

all trims: S

Luxury, Premium Luxury, Sport, V-Series: S

V-Series Blackwing: S; Luxury, Premium Luxury, Sport, V-Series: O

V-Series: S; Sport: O; the CT4-V lists add "performance 4-wheel antilock, 4-wheel disc" to the wording

Sport, V-Series, V-Series Blackwing: O

Sport, V-Series, V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S; V-Series: O

only in: CT4; all trims: S

Sport, V-Series, V-Series Blackwing: S

Luxury, Premium Luxury, Sport, V-Series: S

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

Luxury, Premium Luxury, Sport, V-Series: O

all trims: S

Luxury, V-Series Blackwing: S

all trims: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: O

2025: V-Series Blackwing: S; Luxury, Premium Luxury, Sport, V-Series: O; 2026: all trims: S

Sport, V-Series: S; Premium Luxury, V-Series Blackwing: O

only in: CT4; Luxury, Premium Luxury: S

all trims: S

2025: V-Series Blackwing: S; Luxury, Premium Luxury, Sport, V-Series: O; 2026: all trims: S

Luxury, Premium Luxury, Sport, V-Series: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

all trims: S

Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

2025: Premium Luxury, Sport, V-Series, V-Series Blackwing: O; 2026: Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

all trims: S

Sport, V-Series, V-Series Blackwing: S

Premium Luxury, Sport, V-Series: O

Luxury, Premium Luxury, Sport, V-Series: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

Sport, V-Series, V-Series Blackwing: S

only in: CT4; Luxury, Premium Luxury: S

all trims: O

all trims: O

all trims: O; the 2025 lists call it OnStar Security

all trims: O; the 2025 lists call it OnStar Security

all trims: O; the 2025 lists call it OnStar Security

all trims: O; the 2025 lists call it OnStar Security

all trims: O; the 2025 lists call it OnStar Security

all trims: O; the 2025 lists call it OnStar Insights

all trims: O; the 2025 lists call it OnStar Insights

all trims: O; the 2025 lists call it OnStar Insights

all trims: O; the 2025 lists call it OnStar Insights

all trims: O; the 2025 lists call it OnStar Insights

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: S

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

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

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

all trims: O

all trims: O

all trims: O

Sport, V-Series: S; the 2025 CT4-V lists add "aluminum" before alloy

only in: CT4; Premium Luxury: S

only in: CT4-V and CT4-V Blackwing; V-Series: S

Sport: S; V-Series: O

only in: CT4; Luxury: S

Sport, V-Series: O; the 2025 CT4-V lists add "aluminum" before alloy

only in: CT4; Premium Luxury: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O; the 2025 CT4-V list reads "aluminum alloy"

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S; the 2025 CT4-V list reads "aluminum alloy"

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

all trims: O

all trims: O

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

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

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

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

all trims: O; another meaning than the next R9L row; removes R9M and the Super Cruise (UKL) 3 years; the 2026 lists read "Removes 3 Years of OnStar One"

all trims: O; another meaning than the previous R9L row; included and only available on vehicles shipped to Puerto Rico, the Virgin Islands or Guam; the 2026 lists read "Removes OnStar Basics"

all trims: S; the 2025 lists read "3 Years of OnStar Digital Services"

all trims: O

all trims: O

all trims: O

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

all trims: O

only in: CT4; Luxury: S

all trims: O

Luxury, Premium Luxury, Sport, V-Series: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O; the 2025 CT4-V list reads "aluminum alloy"

only in: CT4; all trims: S

Sport, V-Series: O; the 2025 CT4-V lists add "aluminum" before alloy

only in: CT4

only in: CT4

all trims: S

V-Series Blackwing: S; Premium Luxury, Sport, V-Series: O

Luxury, Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

all trims: S

all trims: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

all trims: S

all trims: S

all trims: S

all trims: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

only in: CT4; Luxury: S

Luxury, Premium Luxury, Sport, V-Series: S

V-Series Blackwing: S; Premium Luxury, Sport, V-Series: O

all trims: S

all trims: S

all trims: S

all trims: S

Premium Luxury, Sport, V-Series, V-Series Blackwing: S

V-Series Blackwing: S; Premium Luxury, Sport, V-Series: O

all trims: S

Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

all trims: S

Luxury, V-Series Blackwing: S

all trims: S

all trims: S

all trims: S

Premium Luxury, Sport, V-Series: O

only in: CT4; all trims: S

V-Series, V-Series Blackwing: S; Luxury, Premium Luxury, Sport: O; CT4 lists name the Bose 14 speaker system; the CT4-V lists print only "Audio system feature" (2026: "Premium Surround Sound 15-speaker system"), with Bose 14 speaker on V-Series and AKG 15 speaker on V-Series Blackwing

only in: CT4-V and CT4-V Blackwing; all trims: O

Premium Luxury, Sport, V-Series: O

Premium Luxury, Sport, V-Series, V-Series Blackwing: O

all trims: S

Premium Luxury, Sport, V-Series: S; V-Series Blackwing: O

all trims: S

only in: CT4

all trims: O

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

all trims: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

Premium Luxury, Sport, V-Series: O

CT4 only; extra cost; not offered on V-Series in 2020; 2020 from GM Authority's 2020 CT4 exterior colors page

CT4 only; extra cost; new in the 2026 guide

extra cost; only on Sport and V-Series; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; 2020 from GM Authority's 2020 CT4 exterior colors page

CT4-V only; extra cost; new in the 2025 guide

extra cost; the 2025 guides mark it new with late availability

no extra cost; all trims; 2020 from GM Authority's 2020 CT4 exterior colors page

no extra cost; all trims; 2020 from GM Authority's 2020 CT4 exterior colors page

CT4-V only; included with and only available with the Petit Pataud Special Edition (ZLZ); limited availability; new in the 2025 guide

extra cost; the 2025 guides mark it new with late availability

extra cost; the 2026 guides mark it no longer available to order; the 2026 CT4 guide offers it on Sport only and marks it new

extra cost; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; new in the 2026 CT4 guide

CT4 only; extra cost; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; only on Sport and V-Series; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; only on Luxury and Premium Luxury; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; only on Luxury and Premium Luxury; 2020 from GM Authority's 2020 CT4 exterior colors page

extra cost; all trims

extra cost; all trims

CT4 only; extra cost

V-Series Blackwing; included with and only available with the Petit Pataud Special Edition (ZLZ); limited availability; seat code AQJ

V-Series Blackwing; included with and only available with the Petit Pataud Special Edition (ZLZ); limited availability; seat code AQJ

CT4 Sport (Pendulum finish aluminum center console trim, requires Climate Package Y6F in the 2025 guide) and CT4-V V-Series (Twenty-Two Carbon Fiber center console trim); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Premium Luxury; Synergy finish aluminum center console trim; requires the Climate Package (Y6F); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Premium Luxury; Synergy finish aluminum center console trim; the 2025 guide requires the Climate Package (Y6F); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Luxury; Pitch Dark Night center console trim; seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Sport (Pendulum finish aluminum center console trim, requires Climate Package Y6F in the 2025 guide) and CT4-V V-Series (Twenty-Two Carbon Fiber center console trim); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

V-Series and V-Series Blackwing; Twenty-Two Carbon Fiber center console trim; seat code AQJ; includes the high performance steering wheel (BTH); on V-Series the 2025 guide requires the Cold Weather Package (Y19)

V-Series Blackwing; Twenty-Two Carbon Fiber center console trim; seat code AQJ; requires the Climate Package (Y6F); includes Natural Tan seat belts (71B), BTH and IWE

V-Series Blackwing; Twenty-Two Carbon Fiber center console trim; seat code AQJ; requires the Climate Package (Y6F); includes the high performance steering wheel (BTH) and the sueded microfiber wrapped interior trim package (IWE)

V-Series Blackwing; Twenty-Two Carbon Fiber center console trim; seat code AQJ; requires the Climate Package (Y6F); includes BTH and IWE

CT4 Luxury; Pitch Dark Night center console trim; seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Premium Luxury; Synergy finish aluminum center console trim; the 2025 guide requires the Climate Package (Y6F); seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

CT4 Sport with Pendulum finish aluminum center console trim; CT4-V V-Series with Twenty-Two Carbon Fiber center console trim; seat code AQ9; 2020 from GM Authority's 2020 CT4 interior colors page

V-Series Blackwing; Twenty-Two Carbon Fiber center console trim; seat code AQ9

only in: CT4-V and CT4-V Blackwing; all trims: O

all trims: O

all trims: O

all trims: O

all trims: O

all trims: O; the 2026 lists print only "Emissions"

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: O

all trims: O