P0H ✓ Factory-verified

Cadillac · Regular Production Option

OnStar Connect Plus, 12 months

Years 2026–27 Models 8 Factory citations 17

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Also described as OnStar Connect Plus plan, 12 months (fleet)

Also documented for BuickChevroletGMC

Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2026 ✓ Factory-verified

  all trims: O

  ⛭ GM factory document — 2026 cadillac ct4 fleet order guide, p.37.

  ⛭ GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.38.

CT5 — Alpha 2 (2020–2026) →

• 2026 ✓ Factory-verified
  ⛭ 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.

Escalade IQ — Ultium BEV (2025–2027) →

• 2026–2027 ✓ Factory-verified

  2027 guide: all trims: O

  ⛭ GM factory document — 2026 cadillac all electric escalade iq fleet order guide rpo codes, p.1.

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

  ⛭ GM factory document — 2027 cadillac all electric escalade iql fleet order guide, p.52.

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

• 2026–2027 ✓ Factory-verified

  2027: O on all trims

  ⛭ GM factory document — 2026 cadillac escalade escalade v fleet order guide, p.49.

  ⛭ GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.59.

Lyriq — BEV3 (2023–2027) →

• 2026–2027 ✓ Factory-verified
  ⛭ GM factory document — 2026 cadillac all electric lyriq lyriq v fleet order guide rpo codes, p.1.

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

Optiq — BEV3 (2025–2027) →

• 2026–2027 ✓ Factory-verified
  ⛭ GM factory document — 2026 cadillac all electric optiq optiq v fleet order guide rpo codes, p.1.

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

Vistiq — BEV3 (2026–2027) →

• 2026–2027 ✓ Factory-verified
  ⛭ GM factory document — 2026 cadillac all electric vistiq fleet order guide, p.55.

  ⛭ GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.55.

XT5 — C1XX (2017–2026) →

• 2026 ✓ Factory-verified

  all trims: O

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

  ⛭ GM factory document — 2026 cadillac xt5 fleet order guide, p.50.

Related codes · mentioned in these notes

O

This page aggregates every documented appearance of P0H in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.