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What Does P0621 Code Mean?

    OBD-II Code P0621 is defined as a Generator Lamp/L Terminal Circuit

    The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P0621.

    P0621 Symptoms

    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P0621 Code

    • Alternator failure
    • Battery failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P0621 Code

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