- 2018, 2022–2023 Factory-verified
2018: Avenir: S; 2022–2023: all trims: S
K4C Factory-verified
Also described as Wireless phone chargingWireless ChargingWireless charging, center console
Also documented for CadillacChevroletGMC
Documented applications
- 2025–2026 Factory-verified
S on all trims; 2027 uses K7A with the same wording
- 2025–2027 Factory-verified
2025–2026: Preferred, Sport Touring, Avenir: O. 2027: Sport Touring, Avenir: O
- 2019 Factory-verified
1SP: S; printed as new
- 2025–2027 Factory-verified
2027: all trims: S
- 2025–2026 Factory-verified
Preferred, Sport Touring: O; Avenir: S
- 2017–2019 Factory-verified
2019: Essence, Premium, Avenir: S
- 2018–2019 Factory-verified
2019: Preferred II, Essence: O (with B26); Avenir: S; GS: O (with BAQ) (2019 Sportback order guide)
This page aggregates every documented appearance of K4C in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.