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Thread: 04 Duramax read issue

  1. #1
    Tuner in Training
    Join Date
    May 2009
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    49

    04 Duramax read issue

    I've read that the 05 LLY's have issues with reading/writing, but I have a 04 LB7 and it isn't wanting to read the entire VCM. It gets to a point (usually 3x.xx%) and then tries to read the TCM. At this point it says that the access has been denied.

    So whats the deal/fix? Do I pull the radio fuse and such?

  2. #2
    HP Tuners Support
    (foff667)
    Bill@HPTuners's Avatar
    Join Date
    Jun 2004
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    28,266
    Try reading in low speed mode for starters ie high speed mode box unchecked.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  3. #3
    Senior Tuner
    Join Date
    Sep 2008
    Posts
    1,668
    I've had constant issues with a friends 2003 LB7 truck...the only difference in low speed mode is that I have to wait longer for it to not work.
    2010 Camaro SS M6. Stock Bottom End, Heads/Cam/Intake/Headers/Exhaust.
    2005 Silverado RCSB. Forged 370 LQ9/Borg-Forced Inductions T6 S484/Jake's Stage 4 4L80E with D3 Brake/4WD.
    2023 Durango Hellcat

  4. #4
    Tuner in Training
    Join Date
    Dec 2011
    Posts
    12
    Same issues here. Not sure whats going on with it.

  5. #5
    Potential Tuner
    Join Date
    Aug 2013
    Posts
    2
    Same issue here

  6. #6
    pull radio fuses, comand start fuses, and even abs fuse
    97 k2500 ecsb 5.7l/4l80/4x4 0411 pcm,thorley tri-y's,true duals(no cats),msd ign.,zz4 cam, tuned with efi live