OBD II Fault Code

  • OBD II P2506

    OBD-II Code Engine may not start is defined as a ECM/PCM Power Input Signal Range/Performance

    The engine computer (PCM) relies on a constant power supply from the Battery. If the PCM does not have sufficient power supply, code P2506 will be set.

    Engine may not start Symptoms

    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P2506 Code

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

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