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Thread: PCM and BCM Swap possibility???

  1. #21
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    Hmmm, you shouldnt have to initiate any security relearn, it should make you do security relearn before it lets you start the vehicle.

    Thats really weird, when I ship a PCM the only things that need to be done are a security relearn before it will start then a CASE relearn to ensure misfire detection is correct. I know some people that wait 6 months to do a CASE so it should run just fine without it.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  2. #22
    Lifetime Member Boost's Avatar
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    I just finished looking at it and got LOTS of info (tried to start with both PCMs, got codes from both PCMs, saved calibrations from both PCMs).

    From the looks of it the old PCM is fried and the new one needs programming.

    Are you saying, that if I flash a good calibration into the new PCM (from a different vehicle / VIN) with my Flashscan, it will run fine and not need any BCM programming? I don't recall even being prompted to do any security learn with the V2.

    Or, this all needs to be done with the Tech2 / SPS? The code in the new one that won't even crank is "Theft Start Enable Signal Not Correct).
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  3. #23
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    Is the security light on the cluster lit? Thats the security relearn Im talking about. You need to try to start the truck, it shouldnt work but the light will come on. Wait 10-11min, light should go out, try to crank truck again and it shouldnt work, light comes on again. Wait another 10-11min, light should go out, try to crank truck and it should fail again, light comes on. Wait 10-11min, light should go off, try to crank truck and it should work. Basically you're forcing the BCM to learn the new PCM (put the right VIN in the PCM before you do this).

    Just flashing it with a Tech II wont bypass this I believe, all used PCMs must go through this.

    You cant change the OS in a P10 with EFILive, only a Tech II/Mongoose or HPTuners.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  4. #24
    Lifetime Member Boost's Avatar
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    Oh yeah now it's all coming back to me. Thanks! I wonder if that alone would work??

    Also, I know you can't full flash these, but can we still cal flash the same and NEWER Cal #s?
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  5. #25
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    The only way to change the cal # is to full flash, so no. If the cal # doesnt match, EFILive wont let you flash it.

    Try it out, change the VIN and do the security relearn (try to start, wait 10-11min til light goes out, try again, wait, try, wait, should start).
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  6. #26
    Lifetime Member Boost's Avatar
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    That is exactly what I plan to do, I appreciate your help! Will let you know tomorrow night
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  7. #27
    Lifetime Member Boost's Avatar
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    Done

    Worked perfect. Thanks again Erik, you helped us out a lot with pointing me in the right direction with this. Everybody's happy.
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  8. #28
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    Quote Originally Posted by Boost View Post
    Done

    Worked perfect. Thanks again Erik, you helped us out a lot with pointing me in the right direction with this. Everybody's happy.
    Great! That security relearn is a step some people overlook, anytime you install a used controller in a different vehicle you need to do this procedure.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  9. #29
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    Security relearns for GM vehicles. Identify your system by the key it uses on teh last page of this pdf.

    http://www.bsecorp.com/files/techtips/ST9303l.pdf

    peace
    Hog
    1997 rcsb stock L31 longblock, Marine Intake with 28# EV6 injectors, L35 2700 stall TC,Hooker LT's 2.007 60ft

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