P051ECrankcase Pressure Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The crankcase pressure sensor measures pressure in the crankcase ventilation (PCV) against atmosphere; Ford's EcoBoost engines use it for the disconnection check P04DB, which needs a sound sensor. P051E means the signal jumps or briefly drops below or above its limits – physically impossible changes, usually from a loose contact. No manufacturer document available to us uses P051E; Ford, Maserati and FCA use only P051A–P051D. The description follows CARB's input component rules.
- What you may notice
- Check engine light on
- Usually no change in driving
- Disconnection check P04DB suspended
- Likely causes
- LikelyLoose contact at the sensor connector
- PossibleChafed harness
- PossibleOil or water in the connector
- RareSensor faulty internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.