P0387 - Crankshaft Position Sensor 'B' Circuit Low

System Information

The Crankshaft Position sensor is used by the ECM to monitor the Engine speed / Crankshaft position. The system will normally use a sensor that produces a signal based on teeth / cut-outs on either the flywheel or crankshaft pulley. The ECM has detected a signal that is at zero or below the normal operating parameters.

Recommended Tests

It is recommended to check the following systems and components.