P2C34Crankcase Pressure Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Circuit Low means the voltage from crankcase pressure sensor B stays under the lowest value the sensor can deliver, typically because the 5 V reference is missing, the signal wire is shorted to ground or the sensor itself has failed. Maserati's bulletin MAS002969/A for MY21 Quattroporte, Ghibli and Levante with the F160 V6 or F154 V8 lists P2C34 next to the sensor-A codes P051B–P051D. Its checklist covers harness continuity and insulation, bent or corroded pins at sensor and ECM, the intermediate signal connection, and about 5 V between pins 1 and 2 at the sensor plug; the sensor sits on bank 1 of the V6 and bank 2 of the V8. As a yardstick, Ford sets the sensor-A low code P051C below 0.44 V after 5 s. While stored, the crankcase ventilation leak check is blocked.
- What you may notice
- MIL on
- Other sensors on the same 5 V supply may report faults too
- Usually no driveability change
- Likely causes
- Likely5 V reference open or shorted to ground
- PossibleSignal wire shorted to ground or chafed insulation
- PossibleCrankcase pressure sensor B internally failed
- RareBent or corroded pins at sensor or ECM
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.