OBD Code P0604

Internal Control Module Random Access Memory (RAM) Error

What’s mean?

OBD2 Code P0604 Definition:
The ECM/PCM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM/PCM is functioning properly. If any malfunction is detected, the will ECM/PCM will set the code and illuminate the engine light.

Symptoms

Possible sumptoms of P0604
– Engine Light ON (or Service Engine Soon Warning Light) – Engine may not start

Possible Causes

Possible causes of P0604
– ECM/PCM Harness power supply circuit is open or shorted – ECM/PCM Programing – Faulty ECM/PCM The Error code is generally activated on detection of the following conditions: Indicates the ECM/PCM has experienced an internal memory fault.

Possible Solutions

– Resecure ECM/PCM connectors – Reprogram ECM/PCM – Replaced ECM/PCM