P2C33Crankcase Pressure Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2C33 means crankcase pressure sensor B delivers a signal inside its electrical limits that the engine module finds implausible, such as an offset from ambient pressure with the engine stopped or values a running engine cannot produce. Two bulletin families name it. Alfa Romeo reprograms both engine control modules of the 2.9 L V6 biturbo in the 2021–2022 Giulia and Stelvio (18-043-23, 18-007-25) because software set P2C33 among other codes; the later issue mentions limp-in. Maserati's MY21 bulletin MAS002969/A for its F160 six-cylinder and F154 eight-cylinder asks for a software update first when P2C33 is the only code, then checks the sensor, harness and blow-by valve; cold weather may play a part. For sensor A Ford sets P051B above a 0.15 inHg offset at rest or implausible pressure at low air flow.
- What you may notice
- MIL on, often together with other PCM codes
- Limp-in mode possible on affected Alfa Romeo models
- Otherwise usually no driveability change
- Likely causes
- LikelyEngine control software needing an update (Alfa Romeo and Maserati V6/V8)
- PossibleSensor offset or drift, partly due to moisture or ice in the port
- PossibleFaulty blow-by (PCV) valve producing abnormal crankcase pressure
- RareHarness or pin resistance shifting the signal
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.