KL9 Factory-verified

Buick · Regular Production Option

Engine control, stop-start system

Years 2017–19, 2022–23, 2025–27 Models 8 Factory citations 23

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Also described as Automatic stop/startEngine control, stop/start systemEngine control

Also documented for Cadillac Chevrolet GMC

Documented applications

Enclave — C1XX (2018–2024)

2022–2023 Factory-verified

2022: all trims: S; 2023: AWD: S; FWD: O, with certain vehicles forced to NSS

GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.9, p.32.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.8, p.30.

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

S on all trims; 2025 guide words it as engine control, stop-start system

GM factory document — 2025 buick all new enclave fleet order guide, p.7.
GM factory document — 2026 buick enclave fleet order guide, p.8.
GM factory document — 2027 buick enclave fleet order guide, p.8.

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

Preferred, Sport Touring, Avenir: S

GM factory document — 2025 buick encore gx fleet order guide, p.8.
GM factory document — 2026 buick encore gx fleet order guide, p.8.
GM factory document — 2027 buick encore gx fleet order guide, p.8.

Envision — D2XX, imported from China (2016–2020)

2018–2019 Factory-verified

all trims: S

GM factory document — 2018 buick envision order guide copy gm authority, p.6, p.20.
GM factory document — 2019 buick envision order guide copy gm authority, p.6, p.23.

Envision — E2XX (2021–2027)

2025–2027 Factory-verified

2027: all trims: S

GM factory document — 2025 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide, p.7.

Envista — VSS-F (2024–2027)

2025–2026 Factory-verified

all trims: S

GM factory document — 2025 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2025 buick envista fleet order guide, p.6.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.6.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

2019: Sport Touring, Avenir: S; Preferred, Essence, Premium: O

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.4.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.5.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.8.

Regal — E2XX (2018–2020)

2018–2019 Factory-verified

2019: all trims: S (2019 Sportback order guide)

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.1, p.5.
GM factory document — 2018 buick regal tourx fleet order guide wayback, p.1.
GM factory document — 2019 buick regal sportback order guide copy gm authority, p.7.

This page aggregates every documented appearance of KL9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.