Equipment group, SLT Standard Edition

Years 2019–20 Models 2 Factory citations 1

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Documented applications

Yukon — K2XX (2015–2020)

2019 Factory-verified

the 2019 guide's SLT Standard Edition column; NICB lists SLT Standard Edition for 2019–2020

GM factory document — 2019 gmc yukon denali fleet order guide wayback, p.1.
2020 Single-source

GM Authority's 2020 Yukon page (trim groups); no factory list or order guide read for 2020; the page does not credit GM for its codes

Yukon XL — K2XX (2015–2020)

2019 Single-source

GM Authority's 2019 Yukon page, which covers the Yukon and Yukon XL; NICB lists an XL SLT Standard Edition for 2019 and 2020

This page aggregates every documented appearance of 4S1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.