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P0604 OBD-II Trouble Code: Internal Control RAM Error
P0604 means an indication of an internal memory fault which may be cause by a faulty fuse, low battery or faulty ECM power supply circuit wiring.

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How to replace ECM on a car with a P0604 code
P0604 is an internal memory error in the ECM. It will need to be replaced. It may be possible to get a pre-programmed ECM for you to put in, but this would be a question to pose to your local...

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