PCM question
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Cadillac Powertrain Control Module (PCM) Tuning Discussion, PCM question in Cadillac Engine Technical Discussion; What is the difference between the cadillac / aurora pcm's by year? I know the Cadillac pcm will control the ...
  1. #1
    motohead_1 is offline Cadillac Owners Member
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    PCM question

    What is the difference between the cadillac / aurora pcm's by year?
    I know the Cadillac pcm will control the 4.0 and vice versa.
    Will the different years interchange? example can I use a 2002 computer in my 1996 or 97 if I were to use an engine from those years and will it even connect to the existing harness?
    Just curious I have access to a newer engine and computer just checking to see what my options are when my motor calls it quits...

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  3. #2
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: PCM question

    Take a look at car-part.com and see what PN's they list, probably same. Also shows year to year interchange, just write down what years you see from part to part. Takes a little study, but often very revealing.

  4. #3
    motohead_1 is offline Cadillac Owners Member
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    Re: PCM question

    I guess what I was asking is will the newer pcm work with some of the older electronics like the bcm, the dic and the radio and so on. I know it would take tons of re-wiring but that is no problem for me.

  5. #4
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: PCM question

    I don't know if anyone has ever dug to find out.

    GM uses a bus architecture and sends many commands to things like DIC and radio and such (depending on year) as a Class2 or CAN bus command. So the answer is grey. Will the PCM send it? don't know, if it isn't designed to chatter with a Cadillac device that isn't on a BOP, then likely no. But could it? Very possibly.

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: PCM question

    One thing certain between 2000 and earlier is the two different ignition systems. I'll bet a 2002 PCM will not drive a 96-97 ICM waste spark system. For starters the CKP's (CranKshaft Position sensor) and crank reluctor wheels are very different.

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