Transmission, 6 speed automatic, electronically controlled, overdrive, Driver Shift Control

Years 2018–19, 2024–27 Models 3 Factory citations 8

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Also described as Transmission, 6 speed automaticTransmission, 6 speed automatic (6T40, gen 3)

Also documented for Chevrolet

Documented applications

Encore — Gamma II (2013–2022)

2018–2019 Factory-verified

only with the LE2 engine; 2018: Sport Touring, Preferred II, Essence, Premium: O; 2019: Sport Touring, Essence: O

GM factory document — 2018 buick encore order guide copy gm authority, p.24.
GM factory document — 2019 buick encore order guide copy gm authority, p.22.

Envista — VSS-F (2024–2027)

2024–2027 Factory-verified

all trims: S; 2024 and 2027 from GM Authority (its 2024 specifications page prints MNH for the Hydra-Matic 6T40; its 2027 page says the transmission carries over from 2026 and prints the code as MHN)

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)

2018–2019 Factory-verified

2019: Base, Preferred, Essence, Premium: S; with LHN; the 2019 guide names the 6T40

GM factory document — 2018 buick lacrosse order guide copy gm authority, p.10.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.9.

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