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Thread: error 4800 reading TCM

  1. 03-28-2010 #1
    kimh
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    error 4800 reading TCM

    Hi
    I am new at this, and is working on a 2005 GMC Sierra 6,6 LLY. It has the Allison 1000 transmission and converter, Super Max turbo, lift pump, aux diesel filter, x-flow exhaust system, upgrade exhaust manifold, KN air intake. Everything from BD Power. I also have a Superchips that is not installed right now.
    Now I am trying to get on with the tuning an the first thing I would do is to read the vcm so I can disable the dtc's BD power is listening. But I get the message " TCM read failed at loc 4800 error : timed out " What can I do ? when I use my Tech2, I have no dtc's and the TCM OS number on the Tech2 is the same that is on the screen before I begin to read the vcm. Please help
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  2. 03-28-2010 #2
    Bill@HPTuners
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    Try reading in low speed mode
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"
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  3. 03-28-2010 #3
    kimh
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    I am trying, I will let you know in about 30 min.
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  4. 03-28-2010 #4
    kimh
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    Thank you that worked, and there was no problem writing a new calibration in high speed.
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