Lots of questions about Saturn PCMs

[Shannen Durphey]

Gary A. Allen, Jr. wrote:

> My PCM label has roughly the following appearance:
> 
> + -----------------------------
> |   21008768                               21023810
> |   AUTOMATIC               SERVICE NO.
> |   POWERTRAIN CONTROL MODULE
> |                           [bar code]
> |               *868768M172558G7J*
> + -----------------------------
> 


> Therefore based upon what you say, my PCM's service/part number is:  21023810

Be careful.  I used "probably."  It would be prudent to keep this in mind.

> and it's "master" calibration is  21008768.  I have not seen any of the other
> numbers
> that you listed (probably looking in the wrong places).  

They are examples from a different vehicle.  They are intended to show that
there are multiple calibration files within one root cal.

> I assume that the number
> 
> " 868768M172558G7" is my PCM's unique serial number.  Should that number also
> be visible in the PCM's memory?  

Unknown.  I didn't even know that they had a unique serial number.
Shannen

> Thanks for your help.
> 
>                                                   Gary
> 
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