P2C90 code meaning
Crankcase Ventilation System - Hose A Disconnected
Powertrain system Generic code P2Cxx codes Check engine light
What P2C90 means
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).
P2C90 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2C90
- Engine warning lamp, often without any other complaint
- Oil mist or oily residue near the disconnected hose
- Possibly unstable idle or lean mixture codes
Common causes of P2C90
- Most likelyPCV hose A pulled off, cracked or with a broken fitting
- Most likelyDetection software too sensitive (Ford, Toyota/Lexus and Stellantis updates)
- PossiblePCV valve or make-up-air check valve not sealing
- Less likelyCrankcase pressure sensor or its signal faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Crankcase vent hose aCrankcase pressure sensorIntake manifold
What each part of P2C90 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| 90 | The exact fault in that area. |
What to do next
- Note P2C90 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2C90
What does P2C90 mean?
P2C90 means "Crankcase Ventilation System - Hose A Disconnected". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C90?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2C90 fail an emissions test?
Yes, it can. P2C90 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2C90 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2C90 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.