Crankcase Pressure Sensor A Circuit Low

Where it lives

For P051C, the sensor sits on the circuit this code reports. The description of P051C reports a fault at the sensor.

Check these first

• Crankcase pressure sensor A signal pulled low
• A short to ground in the sensor A signal wire
• Corrosion or water in the sensor A connector
• A failed pressure element in sensor A reading low
• A clogged sensor A pressure port holding the signal low

What to do next

1. Inspect the crankcase pressure sensor A connector for corrosion
2. Test the sensor A signal wire for a short to ground
3. Check the sensor A reference and ground wires
4. Read crankcase pressure live data on sensor A
5. Replace crankcase pressure sensor A if the signal stays low
6. Clear the code and retest

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