Z66 ✓ Factory-verified

Cadillac · Regular Production Option

Appearance package, premium ride suspension

Years 2003–06, 2023–24 Models 3 Factory citations 5

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Also described as Performance Package

Also documented for ChevroletGMC

Documented applications

Escalade EXT — GMT800 (2002–2006) →

• 2003–2006 ✓ Factory-verified
  ⛭ GM factory document — 2003 cadillac escalade ext rpo code list, p.1.

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

Escalade — GMT800 (2002–2006) →

• 2003–2006 ✓ Factory-verified
  ⛭ GM factory document — 2003 cadillac escalade 2wd rpo code list, p.1.

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

Escalade — T1XX, 5th gen (2021–2027) →

• 2023–2024 ✓ Factory-verified

  the 2023 body-builder list calls it a premium-ride-suspension package; GM Authority 2024: Performance Package, Premium Luxury; the 2026 body-builder list also prints Z66, the 2025–2027 order guides do not; GM Authority for 2024

  ⛭ GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.14.

This page aggregates every documented appearance of Z66 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.