T4L ✓ Factory-verified

Cadillac · Regular Production Option

Headlamps, LED

Years 2018, 2023, 2025–26 Models 7 Factory citations 23

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Also documented for BuickChevroletGMC

Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2025–2026 ✓ Factory-verified

  all trims: S

  ⛭ GM factory document — 2025 cadillac ct4 fleet order guide, p.4.

  ⛭ GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.5.

  ⛭ GM factory document — 2026 cadillac ct4 fleet order guide, p.5.

  ⛭ GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.5.

CT5 — Alpha 2 (2020–2026) →

• 2025–2026 ✓ Factory-verified

  Premium Luxury, Sport: S; V-Series, V-Series Blackwing: S

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

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

  ⛭ GM factory document — 2026 cadillac ct5 fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac ct5 fleet order guide, p.5.

  ⛭ GM factory document — 2026 cadillac ct5 fleet order guide, p.5.

  ⛭ GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.6.

  ⛭ GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.7.

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

• 2023 ✓ Factory-verified
  ⛭ GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.12.

XT4 — E2 (2019–2025) →

• 2025 ✓ Factory-verified

  Premium Luxury, Sport: S

  ⛭ GM factory document — 2025 cadillac xt4 fleet order guide, p.5.

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

XT5 — C1XX (2017–2026) →

• 2025–2026 ✓ Factory-verified

  all trims: S

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

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

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.6.

  ⛭ GM factory document — 2025 cadillac xt5 fleet order guide, p.28.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.7.

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.28.

XT6 — C1XX (2020–2025) →

• 2025 ✓ Factory-verified

  All trims: S

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.6.

  ⛭ GM factory document — 2025 cadillac xt6 fleet order guide, p.64.

XTS — Epsilon II, enlarged (2013–2019) →

• 2018 ● Confirmed

  replaces T95 (GM Authority 2018 XTS changes)

Related codes · mentioned in these notes

ST95V

This page aggregates every documented appearance of T4L in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.