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OBD II Fault Code

  • OBD II P0387

    OBD-II Code Decreased engine performance is defined as a Crankshaft Position Sensor "B" Circuit Low

    The Crankshaft Position Sensor measures the exact rotational speed and position of the crankshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark Timing and Fuel Delivery. This sensor may be built into the distributor on older vehicles. When the PCM detects an irregular signal or no signal, it will set code P0387.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Engine may not start
    • Increased fuel consumption

    Common Problems That Trigger the P0387 Code

    • Broken tone ring
    • Crankshaft Position Sensor (CKP) failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P0387 Code

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