FE4 Factory-verified

Cadillac · Regular Production Option

Suspension system, special ride and handling

Years 2004–09, 2014, 2018, 2025–26 Models 6 Factory citations 14

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Also described as Suspension, special ride and handlingSuspension, high-performance

Also documented for Buick Chevrolet GMC Oldsmobile Pontiac Saturn

Documented applications

ATS — Alpha (2013–2019)

2018 Factory-verified

only in: ATS-V; S

GM factory document — 2018 cadillac ats v fleet order guide wayback, p.4.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.8.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.9.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT5-V, CT5-V Blackwing; V-Series: not available; V-Series Blackwing: S

GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.8.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.10.

CTS — Sigma II (2008–2015)

2009, 2014 Factory-verified

The 2014 guides call it the sport suspension with Magnetic Ride Control; CTS-V Coupe, CTS-V Sedan: S

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)

2004–2007 Factory-verified

GM factory document — 2004 cadillac cts rpo code list, p.1.
GM factory document — 2007 cadillac cts rpo code list, p.1.

STS — Sigma (2005–2011)

2006–2009 Factory-verified

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

This page aggregates every documented appearance of FE4 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.