U66 ✓ Factory-verified

Cadillac · Regular Production Option

Speaker system, 7, custom

Years 2003–07 Models 2 Factory citations 4

Query this via API →

Also described as Speaker system 7, custom

Also documented for BuickChevroletGMC

Documented applications

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.

SRX — Sigma / GMT265 (2004–2009) →

• 2004–2006 ✓ Factory-verified
  ⛭ GM factory document — 2004 cadillac srx rpo code list, p.1.

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

This page aggregates every documented appearance of U66 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.