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Thread: Flashing different OS?

  1. #1
    Lifetime Member driver456's Avatar
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    Default Flashing different OS?

    I have a 99 Chevy Silverado w/09379910 OS pcm.Can I full flash a different OS into it so I can use the COS#5? I have an extra 99-02 pcm just in case.I just don't remember if I could do that.................Paul

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    You need to be running the 02 F Body OS before you can upgade to COS5. Once you have copied all of your tables over you can full flash that OS in, then upgrade to COS5.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
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  3. #3
    Lifetime Member driver456's Avatar
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    Aahhh OK.Thank you.................Paul

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    Lifetime Member driver456's Avatar
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    OK I did a full flash and the truck does not start.I'm getting "U1000 Class 2 data link $1A Transfer Case Shift Control Module" Now what................Paul

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    Lifetime Member GAMEOVER's Avatar
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    What file did you flash into PCM? Was it a truck file or a F-body file?
    Find a truck file that has OS 12212156 or 12202088 so you can use the COS's....
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

  6. #6
    Lifetime Member driver456's Avatar
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    OK I'll try that,Thanks................Paul

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    Lifetime Member driver456's Avatar
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    Quote Originally Posted by GAMEOVER View Post
    What file did you flash into PCM? Was it a truck file or a F-body file?
    Find a truck file that has OS 12212156 or 12202088 so you can use the COS's....
    Thanks man that worked.Started right up I used an 02 silverado w/12212156 OS.I also put in the BCC code.I did not do that on the last one.I don't know if that had anything to do with it.Any way's it starts.Thanks again

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    Lifetime Member GAMEOVER's Avatar
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    Cool....
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

  9. #9
    Joe (Moderator) joecar's Avatar
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    Be sure to read this.


    COS5:
    showthread.php?t=2599
    showthread.php?t=2270


    Attached Files Attached Files

  10. #10
    Lifetime Member driver456's Avatar
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    Well its back again,Same problem.Any idea's?

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