Powertrain, generic (extended)

P2C90 Crankcase Ventilation System - Hose A Disconnected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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).

Likely causes

PCV hose A pulled off, cracked or with a broken fitting
Detection software too sensitive (Ford, Toyota/Lexus and Stellantis updates)
PCV valve or make-up-air check valve not sealing
Crankcase pressure sensor or its signal faulty

Symptoms

  • Engine warning lamp, often without any other complaint
  • Oil mist or oily residue near the disconnected hose
  • Possibly unstable idle or lean mixture codes

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–250
Time0.2–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

crankcase vent hose acrankcase pressure sensorintake manifold

Related codes

P2C91P04DBP04FCP051BP04E1

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.