Following distance indicator

Years 2001, 2015–19, 2022–23, 2025–27 Models 11 Factory citations 29

Also described as Communication system, vehicle, GPS deleteFollowing Distance IndicatorSensor indicator, following distance

Also documented for Cadillac Chevrolet GMC Hummer Oldsmobile Pontiac

Documented applications

Century — W-body (1997–2005)

2001 Factory-verified

the 2001 Century list reads GPS delete; GM's lists for other platforms read this code as a following distance indicator

GM factory document — 2001 buick century rpo code list, p.1.

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

2018: Premium, Avenir: S; 2022–2023: all trims: S, in PDD

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.4, p.20.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.4, p.19.

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

S on all trims

GM factory document — 2025 buick all new enclave fleet order guide, p.2.
GM factory document — 2026 buick enclave fleet order guide, p.2.
GM factory document — 2027 buick enclave fleet order guide, p.3.

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.2.
GM factory document — 2026 buick encore gx fleet order guide, p.2.
GM factory document — 2027 buick encore gx fleet order guide, p.2.

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

2016–2019 Factory-verified

1SN, 1SP: S

GM factory document — 2016 buick envision order guide copy gm authority, p.2, p.11.
GM factory document — 2017 buick envision order guide copy gm authority, p.2, p.13.
GM factory document — 2018 buick envision order guide copy gm authority, p.2, p.13.
GM factory document — 2019 buick envision order guide copy gm authority, p.2, p.14.

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.2.

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.2.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.2.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

2019: Premium, Avenir: S

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.2.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.2.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.3.

LaCrosse — Epsilon II, 2nd gen (2010–2016)

2015 Factory-verified

2015: 1SL, 1SP, 1SR: O; with PCI; new for 2015

GM factory document — 2015 buick lacrosse fleet order guide wayback, p.2.

Regal — E2XX (2018–2020)

2018–2019 Factory-verified

2019: Essence, Avenir, GS: O (2019 Sportback order guide)

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.1.
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.20.

Regal — W-body (1997–2004)

2001 Factory-verified

the 2001 list reads GPS delete; GM's lists for other platforms read this code as a following distance indicator

GM factory document — 2001 buick regal rpo code list, p.1.

This page aggregates every documented appearance of UE4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.