T4Y ✓ Factory-verified

Cadillac · Regular Production Option

Lamps, cornering

Years 2023, 2025–27 Models 5 Factory citations 18

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Also described as Lamps, front park and cornering

Also documented for Buick

Documented applications

Lyriq — BEV3 (2023–2027) →

• 2023, 2025–2027 ✓ Factory-verified

  all trims: S; Professional Vehicle (S)

  ⛭ GM factory document — 2023 cadillac all new electric lyriq fleet order guide wayback, p.3.

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

  ⛭ GM factory document — 2027 cadillac all electric lyriq professional vehicle fleet order guide rpo codes, p.1.

Optiq — BEV3 (2025–2027) →

• 2025–2027 ✓ Factory-verified

  2025: Luxury 1SE, Sport 1SH: S; Luxury 1SC, Sport 1SF: not available; 2026–2027: Premium Luxury, Premium Sport, V-Series: S; Luxury, Sport: not available

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

  ⛭ GM factory document — 2027 cadillac all electric optiq optiq v fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac all electric optiq fleet order guide, p.7.

  ⛭ GM factory document — 2026 cadillac all electric optiq optiq v fleet order guide, p.7.

  ⛭ GM factory document — 2027 cadillac all electric optiq optiq v fleet order guide, p.7.

Vistiq — BEV3 (2026–2027) →

• 2026–2027 ✓ Factory-verified

  all trims: S

  ⛭ GM factory document — 2026 cadillac all electric vistiq fleet order guide, p.56.

  ⛭ GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.56.

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.

Related codes · mentioned in these notes

1SC1SE1SF1SHSV

This page aggregates every documented appearance of T4Y in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.