Chassis, continuously variable real time damping, magneto rheological

Years 2002–09, 2014–15, 2017–19, 2025–26 Models 12 Factory citations 28

Also described as Magnetic Ride Control, continuously variable real time dampingMagnetic Ride ControlActive Chassis Package

Also documented for Buick Chevrolet

Documented applications

ATS — Alpha (2013–2019)

2014–2015, 2018 Factory-verified

the 2018 guides print only Magnetic Ride Control

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

only in: CT4-V and CT4-V Blackwing; all trims: S

GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.7.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.8.

CT5 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT5-V, CT5-V Blackwing; V-Series, 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.

CT6 — Omega (2016–2020)

2017–2018 Factory-verified

Luxury 3.6L, Premium Luxury: O; Platinum: S; Magnetic Ride Control, 20 inch all-season tires (QP1), RQA wheels and active rear steering (NYS); 2018 from the 2018 CT6 order guide (a GM document); the 2019 guide prints F55 as Magnetic Ride Control only (the package is Y43)

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.

CTS — Alpha (2014–2019)

2014–2015, 2018–2019 Factory-verified

Vsport, Vsport Premium: S; the 2018 guide reads Magnetic Ride Control; 2019 per GM's 2019 CTS Sedan order guide (V-Sport and V-Sport Premium Luxury columns agree)

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.
GM factory document — 2019 cadillac cts order guide copy gm authority, p.4.

CTS — Sigma II (2008–2015)

2009 Factory-verified

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

CTS — Sigma / GMX320 (2003–2007)

2005 Factory-verified

2005 list only; also on the 2005 STS list.

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

DTS — G-body (2006–2011)

2006–2009 Factory-verified

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

Seville — G-body (1998–2004)

2002–2004 Factory-verified

the 2002 list prints Magnetorhelogical

GM factory document — 2002 cadillac seville rpo code list, p.1.
GM factory document — 2003 cadillac seville rpo code list, p.1.
GM factory document — 2004 cadillac seville rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2004–2009 Factory-verified

GM factory document — 2004 cadillac srx rpo code list, p.1.
GM factory document — 2009 cadillac srx rpo code list, p.1.

STS — Sigma (2005–2011)

2005–2009 Factory-verified

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

XTS — Epsilon II, enlarged (2013–2019)

2018 Confirmed

no longer available on the XTS and Luxury trims (GM Authority 2018 XTS changes)

This page aggregates every documented appearance of F55 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.