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What Does P0604 Code Mean?

    OBD-II Code P0604 is defined as a Internal Control Module Random Access Memory (RAM) Error

    The engine control module (PCM) performs many vital functions in a modern vehicle, including management of the Fuel and Ignition Systems. When the PCM loses communication with one or more control modules it will set code P0604.

    P0604 Symptoms

    • Decreased engine performance
    • Engine may not start
    • Engine may stall

    Common Problems That Trigger the P0604 Code

    • Powertrain Control Module (PCM) failure
    • Wiring issue
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