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OBD II Fault Code

  • OBD II P0687

    OBD-II Code Hard or no start in cold weather is defined as a ECM/PCM Power Relay Control Circuit High

    The engine computer (PCM) power relay controls battery voltage to the PCM. If the PCM detects an incorrect voltage signal from the power relay, it will set code P0687.

    Hard or no start in cold weather Symptoms

    • Engine may not start
    • Hard or no start in cold weather

    Common Problems That Trigger the P0687 Code

    • Powertrain Control Module (PCM) failure
    • Powertrain Control Module (PCM) power relay failure
    • Wiring issue
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