M3W ✓ Factory-verified

Cadillac · Regular Production Option

Transmission, 9 speed automatic

Years 2025–26 Models 2 Factory citations 8

Query this via API →

Also documented for BuickGMC

Documented applications

XT5 — C1XX (2017–2026) →

• 2025–2026 ✓ Factory-verified

  Sport: S; Premium Luxury: O; Luxury: not available; included with the LGX engine and only available with it; GM Authority engine page lists this code

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.8.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.37.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.10.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.37.

XT6 — C1XX (2020–2025) →

• 2025 ✓ Factory-verified

  Premium Luxury: S; Sport: S; second code for the same wording on the higher groups

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.8.

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.63.

Related codes · mentioned in these notes

LGXOS

This page aggregates every documented appearance of M3W in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.