Crankcase Pressure Sensor A Circuit High

Where it lives

For P051D, the circuit described runs through the sensor. The description of P051D reports a fault at the sensor.

Check these first

• A short to power in the crankcase pressure sensor circuit
• A failed crankcase pressure sensor A
• Excessive blow by raising crankcase pressure
• A clogged crankcase ventilation system

What to do next

1. Check the crankcase pressure sensor circuit for a short to power
2. Read the crankcase pressure sensor A on a scan tool
3. Check the crankcase ventilation system for a clog
4. Replace the crankcase pressure sensor if the signal stays high
5. Clear the code and retest

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