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 notes
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.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Engine may not start
P0604 GMC 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.
GMC Technical Service Bulletins for P0604 code
2008 GMC SIERRA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC SIERRA DENALI POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC YUKON POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC YUKON DENALI POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC YUKON DENALI XL POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC YUKON XL POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2010 GMC TERRAIN POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2007 GMC ACADIA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2008 GMC ACADIA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2009 GMC ACADIA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)