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Thread: LML speed limiter issue

  1. #1
    Lifetime Member
    Join Date
    May 2008

    Default LML speed limiter issue

    On my 15 and some customers LML's I have tuned. If I stand on it it will go well up over 120 but if I let off it has no power still it get back below 75-80. I know this has something to do with the switches but have yet to come up with the right combo for this one issue yet. any help. I have the fuel tables set to 0 for the speed limiter also.
    2015 3500HD crew cab long bed, 6" fabtech, slightly tuned, emissions intact.
    2005 dmax ccsb, EFI live tuned DSP 5 Full built motor, S471 billet single, More better built trans this time. and lots of other things.
    1984 CJ7 powered by a 2000 LS1. 4L60E.
    2012 Jetta TDI 6 speed manual, (yes the dirty the bastard haha)
    2003 Jetta TDI,
    1986 K10 LQ4/4L80E

  2. #2
    Member jay p's Avatar
    Join Date
    Dec 2005


    I'm not sure if the 2500/3500s are the same, but on the 14 and newer 1500s the speed limiter is controlled by the BCM unless it's set to ECM in the ECM tune.


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    2019 Sierra 6.2l
    2017 2500HD L5P
    2010 2500HD LMM (sold)
    2005 Harley Ultra Classic

  3. #3
    Junior Member Sickll7crenshaw's Avatar
    Join Date
    Aug 2016


    Bumping this thread to see what others have figured out, the 15.5 im messing with is doing the same as Lee's but I can run this one up to 90 let off and it will not pick power back up unless I drop speed below 55mph, maybe a switch combo along with some changes in the speedo limiter parameters will do the trick? I see the 15.5s have misc parameters so maybe raising those numbers along with the PTO, Can Bus speed limits hopefully fixes the issue, if anyone could chime in i would sure appreciate it! Thanks

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