Crankcase Pressure Too High
The crankcase pressure sensor reports a value above the safe upper threshold. Excessive crankcase pressure pushes oil past seals and contaminates the PCV path with mist - causes are clogged PCV system, frozen breather hose, or excessive blow-by from worn rings.
Affected components
- Crankcase
- Pcv valve
- Cylinder compression
Common causes
- High likelihood: PCV path blocked or frozen
- Medium likelihood: Excessive blow-by from worn 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.