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Our automotive experts have put together the following information about the P0377 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0377 code.

OBD II Fault Code

  • OBD II P0377

    OBD-II Code Decreased engine performance is defined as a Timing Reference High Resolution Signal "B" Too Few Pulses

    The engine control module (PCM) sends a duplicate signal of the crankshaft position sensor (CKP) to the Fuel Injection Control Module (FICM). If the signal to the FICM becomes corrupt, the PCM will set code P0377.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Engine may not start

    Common Problems That Trigger the P0377 Code

    • Crankshaft Position Sensor (CKP) failure
    • Fuel injection control module (FICM) failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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