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OBD II Fault Code

  • OBD II P0378

    OBD-II Code Decreased engine performance is defined as a Timing Reference High Resolution Signal "B" Intermittent/Erratic

    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 P0378.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Engine may not start

    Common Problems That Trigger the P0378 Code

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

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