Equipment group, CT6 base trim, 2.0L turbo, rear-wheel drive

Years 2006–09, 2014–17, 2019, 2023, 2025–26 Models 10 Factory citations 13

Also described as Equipment group, Standard, 2.5LOption package 01Equipment group, base trim (Standard, later Escalade)Equipment group 1SA (base trim)Package, option 01Equipment group, Standard, front-wheel driveEquipment group, Luxury, front-wheel driveEquipment group, Luxury, FWDEquipment group 1SA, XTS

Also documented for Buick Chevrolet GMC Pontiac Saturn

Documented applications

ATS — Alpha (2013–2019)

2014 Factory-verified

model 6AB69, 2.5L rear-wheel drive

GM factory document — 2014 cadillac ats fleet order guide wayback, p.6.

CT6 — Omega (2016–2020)

2017 Factory-verified

column heading of the guide's equipment pages (model 6KH69)

GM factory document — 2017 cadillac ct6 fleet order guide wayback, p.2.
GM factory document — 2017 cadillac ct6 fleet order guide wayback, p.4.

CTS — Sigma / GMX320 (2003–2007)

2007 Factory-verified

GM factory document — 2007 cadillac cts rpo code list, p.1.

Escalade — K2XX (2015–2020)

2015, 2017, 2019 Factory-verified

the 2015 guide's Standard column; NICB lists Standard for 2015–2016; GM Authority for 2017 (renamed) and 2019

GM factory document — 2015 cadillac escalade fleet order guide wayback, p.2.

Escalade — T1XX, 5th gen (2021–2027)

2023, 2025–2026 Factory-verified

2025: Luxury; 2026: Escalade

GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.9.
GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.1.
GM factory document — 2026 cadillac escalade escalade v fleet order guide, p.1.

SRX — Sigma / GMT265 (2004–2009)

2006–2009 Factory-verified

GM factory document — 2006 cadillac srx rpo code list, p.1.
GM factory document — 2009 cadillac srx rpo code list, p.1.

SRX — Theta Premium / GMT166 (2010–2016)

2016 Confirmed

Front-wheel drive only; GM's 2016 SRX order guide (GM Authority's copy, published September 18, 2015)

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

Luxury trim with the FWD code standard; model number printed 6NF26

GM factory document — 2025 cadillac xt5 fleet order guide, p.1.
GM factory document — 2026 cadillac xt5 fleet order guide, p.1.

XT6 — C1XX (2020–2025)

2025 Factory-verified

FWD column of the Luxury model 6NV26; FWD is standard in 1SA and 1SC and F48 in 1SB, 1SD and 1SF

GM factory document — 2025 cadillac xt6 fleet order guide, p.7.

XTS — Epsilon II, enlarged (2013–2019)

2017 Confirmed

the base series, renamed from Standard 1SA for the model year (GM Authority 2017 XTS changes)

This page aggregates every documented appearance of 1SA in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.