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P051A

Crankcase Pressure Sensor A Circuit

A general circuit fault is detected on the crankcase pressure sensor A - typically used to monitor PCV operation and detect a clogged separator or disconnected hose.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: easy

Common causes

Ordered by how often each turns out to be the cause.

  • Open in sensor or wiringCommon

Parts involved

  • Crankcase Pressure Sensor A

P051A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.