FE9 Factory-verified

Cadillac · Regular Production Option

Emissions, federal requirements

Years 1999, 2005–09, 2014–19, 2023, 2025–27 Models 24 Factory citations 61

Query this via API →

Also described as Emissions, Federal requirementsCertification, emission, federalEmissions, federalCertification emission, federal

Also documented for Buick Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

ATS — Alpha (2013–2019)

2014–2015, 2018 Factory-verified internal

GM factory document — 2014 cadillac ats fleet order guide wayback, p.10.
GM factory document — 2015 cadillac ats coupe fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ats v fleet order guide wayback, p.4.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified internal

all trims: O

GM factory document — 2025 cadillac ct4 fleet order guide, p.15.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.15.
GM factory document — 2026 cadillac ct4 fleet order guide, p.13.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.15.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified internal

GM factory document — 2025 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

CT6 — Omega (2016–2020)

2017–2019 Factory-verified internal

; all trims: O; 2018 and 2019 from the 2018 and 2019 CT6 order guides (GM documents)

GM factory document — 2017 cadillac ct6 fleet order guide wayback, p.4.
GM factory document — 2018 cadillac ct6 order guide copy gm authority, p.57, p.60.
GM factory document — 2019 cadillac ct6 order guide copy gm authority, p.51, p.54.

CTS — Alpha (2014–2019)

2014–2015, 2018 Factory-verified internal

GM factory document — 2014 cadillac cts sedan fleet order guide wayback, p.4.
GM factory document — 2015 cadillac cts sedan fleet order guide wayback, p.4.
GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.4.

CTS — Sigma II (2008–2015)

2008–2009, 2014 Factory-verified internal

The 2014 guides list it as Federal emissions; every 2014 coupe and the CTS-V Sedan: O

GM factory document — 2008 cadillac cts rpo code list, p.1.
GM factory document — 2009 cadillac cts rpo code list, p.1.
GM factory document — 2014 cadillac cts coupe and cts v coupe fleet order guide wayback, p.3.
GM factory document — 2014 cadillac cts v sedan fleet order guide wayback, p.4.

CTS — Sigma / GMX320 (2003–2007)

2007 Factory-verified internal

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

DTS — G-body (2006–2011)

2006–2009 Factory-verified internal

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

Escalade EXT — GMT900 (2007–2013)

2007–2009 Factory-verified internal

GM factory document — 2007 cadillac escalade ext rpo code list, p.1.
GM factory document — 2009 cadillac escalade ext rpo code list, p.1.

Escalade — GMT900 (2007–2014)

2007–2009 Factory-verified internal

GM factory document — 2007 cadillac escalade rpo code list, p.1.
GM factory document — 2009 cadillac escalade rpo code list, p.1.

Escalade IQ — Ultium BEV (2025–2027)

2025–2027 Factory-verified internal

GM factory document — 2025 cadillac all electric escalade iq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric escalade iql fleet order guide rpo codes, p.1.

Escalade — K2XX (2015–2020)

2015–2017 Factory-verified internal

GM factory document — 2015 cadillac escalade fleet order guide wayback, p.4.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.7.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.18.

Escalade — T1XX, 5th gen (2021–2027)

2023, 2025–2027 Factory-verified internal

GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.10.
GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.17.
GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.19.

Lyriq — BEV3 (2023–2027)

2025–2027 Factory-verified internal

GM factory document — 2025 cadillac all electric lyriq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric lyriq professional vehicle fleet order guide rpo codes, p.1.

Optiq — BEV3 (2025–2027)

2025–2027 Factory-verified internal

GM factory document — 2025 cadillac all electric optiq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric optiq optiq v fleet order guide rpo codes, p.1.

Seville — G-body (1998–2004)

1999 Factory-verified internal

GM factory document — 1999 cadillac seville rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2006–2009 Factory-verified internal

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 internal

; all trims: O; GM's 2016 SRX order guide (GM Authority's copy, published September 18, 2015)

STS — Sigma (2005–2011)

2007–2009 Factory-verified internal

GM factory document — 2007 cadillac sts rpo code list, p.1.
GM factory document — 2009 cadillac sts rpo code list, p.1.

Vistiq — BEV3 (2026–2027)

2026–2027 Factory-verified internal

GM factory document — 2026 cadillac all electric vistiq fleet order guide, p.54.
GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.54.

XLR — Y-body (2004–2009)

2005–2009 Factory-verified internal

GM factory document — 2005 cadillac xlr rpo code list, p.1.
GM factory document — 2009 cadillac xlr rpo code list, p.1.

XT4 — E2 (2019–2025)

2025 Factory-verified internal

Premium Luxury, Sport: O

GM factory document — 2025 cadillac xt4 fleet order guide, p.11.
GM factory document — 2025 cadillac xt4 fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified internal

; all trims: O

GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac xt5 professional vehicles fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac xt5 fleet order guide, p.15.
GM factory document — 2025 cadillac xt5 fleet order guide, p.34.
GM factory document — 2026 cadillac xt5 fleet order guide, p.16.
GM factory document — 2026 cadillac xt5 fleet order guide, p.35.

XT6 — C1XX (2020–2025)

2025 Factory-verified internal

; All trims: O

GM factory document — 2025 cadillac xt6 fleet order guide, p.17.
GM factory document — 2025 cadillac xt6 fleet order guide, p.62.

This page aggregates every documented appearance of FE9 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.