P0604 GMC Control Module Random Access Memory

Possible causes

– Faulty Powertrain Control Module (PCM)
– PCM harness is open or shorted
– PCM circuit poor electrical connection
– PCM Programming

Tech description

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 obd code mean?

Indicates the Powertrain Control Module (PCM) has experienced an internal memory fault.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine may not start

P0604 GMC OBD Code Description