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Thread: Ls1b pcm won't unlock

  1. #1
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    Default Ls1b pcm won't unlock

    I've been working on a 2005 Chevy Silverado with a 4.8L and an Ls1b pcm. When I try to read the stock tune from the pcm it recognizes the controller but fails to unlock it and read the tune even when i try the alternate unlock strategies. I was able to read the DTC's and it threw a b1000 ecm malfunction code. I'm wondering if there's something i'm missing or if the pcm isn't any good. Any advice would be appreciated.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Which V7 and V8 build versions do you have installed...?

  3. #3
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    For V8 I have version 8.2.2 build 276 and the V7.5.7 build 283

  4. #4
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    You probably have to change the settings. This was an issue in one of the updates a few months back around april/may.

    These 2 post explain it better.

    https://forum.efilive.com/showthread...l=1#post221779
    https://forum.efilive.com/showthread...l=1#post221834

  5. #5
    Joe (Moderator) joecar's Avatar
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    This is also related: Error-0333

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