FHB ✓ Factory-verified

Cadillac · Regular Production Option

Axle, 3.47 ratio

Years 2025–26 Models 2 Factory citations 9

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Also documented for BuickChevroletGMC

Documented applications

XT4 — E2 (2019–2025) →

• 2025 ✓ Factory-verified

  Premium Luxury, Sport: S

  ⛭ GM factory document — 2025 cadillac xt4 fleet order guide, p.6.

  ⛭ GM factory document — 2025 cadillac xt4 fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026) →

• 2025–2026 ✓ Factory-verified

  Luxury, Premium Luxury: S; Sport: not available; comes with the LSY engine; upgradeable to FXC when LGX is ordered

  ⛭ 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.7.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.9.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.33.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.9.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.34.

Related codes · mentioned in these notes

FXCLGXLSYS

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