P2C90Crankcase Ventilation System - Hose A Disconnected
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Under California's phase-in (20 % of 2023, 50 % of 2024, all 2025 models) every PCV hose carrying crankcase vapour must be watched for a break as large as its smallest bore, so makers moved from the general P04DB to per-hose codes. P2C90 covers hose A. Ford's 2024 summary says P2C90 replaces P04DB: the dirty side is tested once per trip while cranking, the clean side once per trip above 5 lb/min airflow, backed by extrapolation and flow-model checks over up to 15 minutes. Bulletins come from Ford (2024 F-150 3.5 and 5.2, 2026 Transit 3.5: PCV check plus software), Toyota and Lexus (2023 Crown, RX 500h: false codes, ECM logic changed) and Stellantis (Jeep 2.0 turbo; Wagoneer 3.0 with a too short make-up-air valve spring).
- What you may notice
- Engine warning lamp, often without any other complaint
- Oil mist or oily residue near the disconnected hose
- Possibly unstable idle or lean mixture codes
- Likely causes
- LikelyPCV hose A pulled off, cracked or with a broken fitting
- LikelyDetection software too sensitive (Ford, Toyota/Lexus and Stellantis updates)
- PossiblePCV valve or make-up-air check valve not sealing
- RareCrankcase pressure sensor or its signal faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.