P2C90
Crankcase Ventilation System - Hose A Disconnected
The ECM detects that crankcase ventilation hose A is disconnected based on pressure or vacuum signals. Unmetered air ingress and oil mist escape are possible.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Hose disconnected at fittingCommon
- Hose split or perforatedPossible
Parts involved
- Crankcase Vent Hose A
- Crankcase Pressure Sensor
- Intake Manifold
P2C90 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.