P2C90 Crankcase ventilation hose A disconnected

P2C90 crankcase ventilation system, hose A disconnected

P2C90 in short

P2C90 means the computer thinks a crankcase ventilation hose, hose A, has come off or is leaking. Chrysler lists it that way and Ford ties it to the PCV system on the 2024 F-150 PowerBoost. Check the PCV hoses and ask about a software update. GR Corolla owners report limp mode.

The positive crankcase ventilation system pulls crankcase gas back into the intake. The computer watches crankcase pressure and sets P2C90 when it concludes a vent hose has come apart.

FCA names the code as Crankcase Ventilation System, Hose A Disconnected and issues PCM updates for it on the Wrangler, Wagoneer and Ram 1500. Ford's bulletin for the 2024 F-150 PowerBoost says to inspect the PCV system and reprogram the PCM.

On the 2025 GR Corolla, four owners report P2C90 with limp mode and driver aids off. Dealers found nothing in the PCV system, and one owner says the code returned after a Toyota ECU update.

Most likely causes

  1. Crankcase vent hose loose, cracked or off

    Supported by vehicle data
    Why it ranks here
    FCA names the code as hose A disconnected and Ford says to inspect the PCV system. GR Corolla dealers inspected and found nothing, so a visible hose fault is not always the answer.
    What would change this
    Rises if a hose is off, split or oily at a connection. Falls if the hoses are sound and the code returns.
    How to test the crankcase ventilation (pcv) valve

  2. Powertrain computer software that needs updating (some models)

    Supported by vehicle data
    Why it ranks here
    FCA flash updates for the Wrangler and Ford's F-150 PowerBoost bulletin both include a PCM update for P2C90.
    What would change this
    Rises if a dealer finds your VIN covered and the software old. Falls if the software is current and the code returns.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Ask a dealer whether your VIN has a PCM update or PCV bulletin for P2C90.

    Low risk

  2. With the engine off and cold, look over the crankcase vent hoses and their connections for a hose that is loose, split or soaked in oil.

    Low risk

Symptoms

  • Check engine light
  • Limp mode, with all-wheel drive and driver-assist systems off until restart Gets more serious: stop and have it checked.

Compare with: Check engine light with loss of power

How to fix

  1. With the engine off and cold, look over the visible crankcase vent hoses for one that has come off or cracked.

  2. Ask a dealer whether your VIN has an open software update for P2C90.

Parts and cost context

  • Crankcase ventilation (PCV) valve:Check hoses and connections before buying parts; cost varies by model, so get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Toyota

  • 2025 · GR Corolla

    Supported by vehicle data

    Four 2025 GR Corolla owners report P2C90 with limp mode and driver aids switched off. Dealers found nothing in the PCV system, and one owner reports the code returned after a software update.

Jeep

  • 2018–2020 · Wrangler

    Supported by vehicle data

    FCA bulletins S2018000010 and 18-012-20 name the Wrangler. Bulletin status is not verified.

  • S2018000010Status unverified

    MIL with P2C90 hose A disconnected or P04FC

    2018–2020wrangler · NHTSA 10181540

    Service information for P2C90 and P04FC on the Wrangler.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 18-012-20 REV. BStatus unverified

    PCM update, P2C90

    2020wrangler · NHTSA 10177542

    Reprogram the PCM when P2C90, P0607 or P0506 is set.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ford

  • 2024 · F-150

    Supported by vehicle data

    Ford TSB 24-2200 covers the 2024 F-150 with the 3.5L PowerBoost built on or before 14 May 2024. Bulletin status is not verified.

  • TSB 24-2200Status unverified

    MIL with P2C90 on 3.5L PowerBoost

    2024f-150 · NHTSA 11006519

    Inspect the PCV system and reprogram the PCM.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P2C90 yet.

All Fuel trim (air-fuel mixture) codes

P2C90 questions

Why does P2C90 turn off my driver assists?

GR Corolla owners report the check engine light switching off AWD and driver aids until restarts. Have it inspected; dealers there found no PCV fault.

Sources and review

  1. NHTSA complaint ODI 11690162 — NHTSA Office of Defects Investigation (owner complaint)
  2. NHTSA complaint ODI 11718019 — NHTSA Office of Defects Investigation (owner complaint)
  3. NHTSA complaint ODI 11718284 — NHTSA Office of Defects Investigation (owner complaint)
  4. FCA bulletin S2018000010, MIL with P2C90 or P04FC (2018-2020 Wrangler; NHTSA 10181540) — FCA US LLC
  5. FCA flash bulletin 18-012-20 Rev B, PCM updates (2020 Wrangler; NHTSA 10177542) — FCA US LLC
  6. Ford TSB 24-2200, MIL with P2C90 (2024 F-150 3.5L PowerBoost; NHTSA 11006519) — Ford Motor Company
  7. NHTSA complaint ODI 11712533 — NHTSA Office of Defects Investigation (owner complaint)
Last reviewed
Written by
Saurabh K.
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