Headlamps, high intensity discharge, right-hand rule of road

Years 2002–09 Models 5 Factory citations 11

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Documented applications

CTS — Sigma II (2008–2015)

2008–2009 Factory-verified

The 2009 list adds "Do not use after 2009 Global/New Major Programs".

GM factory document — 2008 cadillac cts rpo code list, p.1.
GM factory document — 2009 cadillac cts rpo code list, p.1.

CTS — Sigma / GMX320 (2003–2007)

2003–2007 Factory-verified

GM factory document — 2003 cadillac cts rpo code list, p.1.
GM factory document — 2007 cadillac cts rpo code list, p.1.

Seville — G-body (1998–2004)

2002–2004 Factory-verified

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

The 2009 list adds "Do not use after 2009 Global/New major programs".

GM factory document — 2005 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 TT8 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.