PCM Swap Help!! Replacement for 12576106??

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09-28-2020
bumpc723

PCM Swap Help!! Replacement for 12576106??

First time poster here, looking for some help.

I was tuning a 2003 Sierra 5.3 and the ECM bricked during the second flash of the day. Bad battery ground :banghead:.The ECM part # is 12576106, but I had a 12602801 laying around so I threw it in the truck. I was going to try to flash the stock 5.3 Sierra file onto the 801but it said the vehicle said not licensed and didn't give me the option to license it. I put the 12576106 on my bench harness and it still seems like its bricked. Having a hard time finding another 12576106 for a reasonable price so I'm looking for other options.

Will the 801 work in place of the 106? And if so, why can't I license it?
09-28-2020
Jon S.

Quote:

Originally Posted by bumpc723

First time poster here, looking for some help.

I was tuning a 2003 Sierra 5.3 and the ECM bricked during the second flash of the day. Bad battery ground :banghead:.The ECM part # is 12576106, but I had a 12200411 laying around so I threw it in the truck. I was going to try to flash the stock 5.3 Sierra file onto the 411 but it said the vehicle said not licensed and didn't give me the option to license it. I put the 12576106 on my bench harness and it still seems like its bricked. Having a hard time finding another 12576106 for a reasonable price so I'm looking for other options.

Will the 411 work in place of the 106? And if so, why can't I license it?

The 2003 P59 PCM (12576106) has a 1Mb flash memory, and uses PCM connectors with Blue and Green retainers.

The 2001 or 2002 P01 PCM (12200411) has a 512Kb flash memory, and uses PCM connectors with Blue and Red retainers.

Are you familiar with the old phrase "trying to put a square peg in a round hole" ?
09-28-2020
bumpc723

Quote:

Originally Posted by Jon S.

The 2003 P59 PCM (12576106) has a 1Mb flash memory, and uses PCM connectors with Blue and Green retainers.

The 2001 or 2002 P01 PCM (12200411) has a 512Kb flash memory, and uses PCM connectors with Blue and Red retainers.

Are you familiar with the old phrase "trying to put a square peg in a round hole" ?

Jon,
Sorry I had my part numbers wrong in the original post. I swapped it for #12602801
09-28-2020
Jon S.

OK - that makes more sense.

Service # 12602801 is a 1MB P59 PCM - used from 2005 to 2007.

Technically, it could be used as a replacement for your 2003 P59 - the difficulty is often the 2003 OS. The 2003 1Mb P59 OS seem to be unique - and do not flash the same as the 2004 to 2007 OS do.

In 20 years I have only bricked (temporarily) two controllers. One such instance was using GM software and a Tech 2 to program a 2003 OS onto a replacement PCM. If this is a conversion vehicle that you are working with, then flashing the replacement PCM with a 2004 OS would be my suggestion.