P0604 CHEVROLET - Control Module Random Access Memory
Faulty Powertrain Control Module (PCM)
PCM harness is open or shorted
PCM circuit poor electrical connection
Check the Powertrain Control Module (PCM) fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the PCM.
When is the code detected?
Indicates the Powertrain Control Module (PCM) has experienced an internal memory fault.
Engine Light ON (or Service Engine Soon Warning Light)
Engine may not start
P0604 Chevrolet Description
The Powertrain Control Module (PCM
) performs an internal self-test on it's Random Access Memory (RAM) or read/write memory. If this self-test fails, the P0604 code will set.