Crankcase Ventilation System Performance
A general performance fault of the crankcase ventilation system - PCV pressure or flow does not match the engine model. Possible causes are a clogged PCV valve, blocked separator, oil-filler cap with a damaged seal, or excessive blow-by from worn rings.
Affected components
- Pcv valve
- Oil separator
- Oil filler cap
Common causes
- High likelihood: PCV valve clogged or stuck
- Medium likelihood: Oil separator clogged
- Low likelihood: Excessive blow-by from worn piston rings
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.