Crankshaft Position Sensor B Circuit Low

Where it lives

For P0387, the circuit described runs through the sensor. The description of P0387 reports a fault at the sensor.

Check these first

• A short to ground on the sensor B signal wire
• A failed crankshaft position sensor B
• A pinched sensor B harness
• Water in the sensor B connector
• A weak pull up on the sensor B input in the PCM

What to do next

1. Check the sensor B signal voltage with the key on
2. Look for a short to ground in the sensor B harness
3. Inspect the sensor B connector for water or corrosion
4. Verify sensor B ground and reference voltage
5. Replace crankshaft position sensor B if the circuit is clean
6. Clear the code and retest

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