Q4C ✓ Factory-verified

Cadillac · Regular Production Option

Tires, 235/40R18 summer-only, run-flat

Years 2025–26 Models 1 Factory citations 2

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Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2025–2026 ✓ Factory-verified

  only in: CT4-V and CT4-V Blackwing; V-Series: S

  ⛭ GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.9.

  ⛭ GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.6.

Related codes · mentioned in these notes

SV

This page aggregates every documented appearance of Q4C in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.