Engine Crankcase Pressure - Exceeds Threshold

The computer monitors the air pressure in the engine crankcase. When the pressure goes above normal (like over 3-5 inches of water column), it signals a problem, usually caused by blow-by gasses from worn piston rings or issues with the PCV system.

The engine control unit (ECU) checks crankcase pressure through a sensor. If the value reads above the set limit, it triggers the fault code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the engine oil level. Is it overfilled? If yes, correct it and check for codes again.
2. 22. Inspect the PCV valve and hoses. Are they clogged or cracked? Replace as needed and retest.
3. 33. Measure crankcase pressure using a gauge. Is it over 3-5 inches of water column? If yes, consider further engine inspection.
4. 44. Look for signs of oil leaks or blow-by. If you see excessive oil leaks, it’s a sign of worn rings or engine wear.
5. 55. Check for intake manifold leaks using a smoke machine or propane test. Is there any intake leak? If yes, repair and retest.

• Worn piston rings leading to excessive blow-by
• Faulty PCV (Positive Crankcase Ventilation) system
• Clogged air filter or crankcase ventilation passages
• Intake manifold leaks
• Overfilled engine oil

$$$