C3Q ✓ Factory-verified

Cadillac · Regular Production Option

Sill plate, front, unique

Years 2023, 2025–26 Models 3 Factory citations 6

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Also described as Sill plate, unique, frontSill plates, bright

Also documented for ChevroletGMC

Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2025 ✓ Factory-verified

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

  ⛭ GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.28.

CT5 — Alpha 2 (2020–2026) →

• 2025 ✓ Factory-verified

  only in: CT5-V, CT5-V Blackwing; V-Series: not available; V-Series Blackwing: O

  ⛭ GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.29.

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

• 2023, 2025–2026 ✓ Factory-verified

  2026: base Escalade: S

  ⛭ GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.10.

  ⛭ GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.10.

  ⛭ GM factory document — 2026 cadillac escalade escalade v fleet order guide, p.11.

Related codes · mentioned in these notes

CT5OSV

This page aggregates every documented appearance of C3Q in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.