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Our automotive experts have put together the following information about the P0623 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 P0623 code.

OBD II Fault Code

  • OBD II P0623

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Generator Lamp Control Circuit

    If the Battery voltage gets too low, it will illuminated the Battery/Charging system warning light on the instrument cluster. The light should illuminated for a few seconds when the key is initially turned on. If the warning light fails to light, the engine control module (PCM) will set code P0623.

    Common Problems That Trigger the P0623 Code

    • Instrument cluster failure
    • Powertrain Control Module (PCM) failure
    • Warning light bulb failure
    • Wiring issue
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