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.
Affected components
- Crankcase vent hose a
- Crankcase pressure sensor
- Intake manifold
Common causes
- High likelihood: Hose disconnected at fitting
- Medium likelihood: Hose split or perforated
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.