How to fix code P0604?? - 2001 BMW 5 Series

P0604 for bmw and gmc is for ecu other cars or truck p0604 is for something else

On a 2000 E46 if you change the tire size to slightly different then factory the car will go in LIMP mode and not exceed 25.

I bought a 2003 330xi and have this code but I also see 225/50/17 size tires and this model calls for 205/50/17. There are many alternates and this initial size from previous owner is not one of them.

Changing the tire size and pressure , alignment and balancing can cause issues that lead to this code ,

I've also seen grounds and electrical connection issues cause this RAM error.

Its not dead until you want it to be. Don't jump to ECM conclusions unless your jump starting constantly with the generating car running.

Then u maybe popped ur ECM capacitors

It shows that your vehicles RAM is getting error message. its better to change ur ECU assembly rather than repairing the CPU assembly in your car. Thanks

Hello! a P0604 is telling you that one of the control modules, the Integrated Chassis Management (ICM) module has an internal Random Access Memory (RAM) error....Take it to an authorized BMW dealer and have a diagnostic run on the module...May only need to be "flashed" (software re-load)...

Guru.Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

It's an internal control module random access memory error code. It has likely been triggered bacause your ECM has detected a memory fault or error. Check the fuse for the ECM to make sure that it hasn't blown. Also you may want to check the wire harness to ensure that its fully depressed into position on the ECM. Other than that you're probably looking at dealer service.