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Thread: DEF Speed limiter

  1. #1
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    Default DEF Speed limiter

    I'm working on a 2015 GMC with a full exhaust system removal, all is well with the truck and it's happy with no codes then after a 150 miles it has 65mph speed limiter with no messages or codes, then after another 50 miles it's limited to 55. So I'm assuming it's the def related limiters but I have all 3 maxed and the def speed limiter option set to no but im still being limited. It goes away for another 150 miles after a new tune is flashed. Anyone else seeing this?
    04 LB7
    2010 LMM
    2015 LML

  2. #2
    Lifetime Member Mitco39's Avatar
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    I have literally 50-60 hours in trying to figure out why some deletes work and others do not. Im not surprised you have this issue, however I did do a 15 last week and so far I have not heard back from him (although I hope this means that he just hasn't drove the truck over 150 miles yet). Anyone who has spent years tuning with EFILive should have no issue just going in and playing with the settings they give you. But unfortunately that is not the case. Everytime I think I found something that may work I hit wall.

    Have you played with the CanBus incoming and outgoing messages?

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    I have not yet but that's the next step
    .
    04 LB7
    2010 LMM
    2015 LML

  4. #4
    Lifetime Member Mitco39's Avatar
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    Play around in there. I had to to get the 15 to settle down.

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    Ok thanks descriptions were pretty vague so I was a little hesitant.
    04 LB7
    2010 LMM
    2015 LML

  6. #6
    Lifetime Member Mitco39's Avatar
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    Ive played a bunch in there and havent found nothing that cannot be reversed with a flash.

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    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by rcr1978 View Post
    Ok thanks descriptions were pretty vague so I was a little hesitant.
    For a reason, it is open heart surgery in there.
    I no longer monitor the forum, please either post your question or create a support ticket.

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    Rumor mill makes it sound like if you change the wrong value in the Canbus it will lock up the ECM. Has anyone had this happen or know which tables/values that should be absolutely off limits?

  9. #9
    Lifetime Member Dmaxink's Avatar
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    Quote Originally Posted by rfinn04 View Post
    Rumor mill makes it sound like if you change the wrong value in the Canbus it will lock up the ECM. Has anyone had this happen or know which tables/values that should be absolutely off limits?
    If it's in efilive, then it's ok to change.... Just know your goal and what the table means before you change it.
    -Kory

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

    http://www.PPEI.com/

  10. #10
    Lifetime Member dansdieselp's Avatar
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    It will run fine with every unknown CAN message turned off, but it won't fix the problem. You'll lose Tow Haul, Exhaust Brake and other random functions.
    Dan's Diesel Performance
    www.dansdieselperformance.com

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