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93 6.5 with 4l80e limp mode no codes

Discussion in 'All Other Transmissions' started by Matthew Sites, Dec 17, 2017.

  1. Matthew Sites

    Matthew Sites New Member

    1
    0
    Dec 17, 2017
    Mitchell,indiana
    Greetings from Mitchell,Indiana
    My 17 year old son just bought a 93 k2500 4x4 with 6.5. While driving it it shift perfect. (Maybe a little converter chater)
    Stop to fuel with truck running. Pull away ans is in 2nd ans will not come out. No codes or anything. Changed 2 selenoids worked perfect for about 40 miles. Stopped and same thing. Cleaned harnesses drove good and then same thing. It has to be something simple. Can you pull codes dorectly from tranny? As none are coming thru obd1
    Thanks in advance
    Matthew
     
  2. Jaryd

    Jaryd Oh the sound a 6.5 makes

    648
    792
    Nov 27, 2016
    Hodges, SC
    I’m not a transmission guy but I will say hello. Welcome to TTS.

    There are some transmission guys here that might be able to help you out. @THEFERMANATOR @WarWagon
     
    MrMarty51 likes this.
  3. ak diesel driver

    ak diesel driver 6.5 driver

    12,758
    2,762
    Feb 7, 2009
    alaska
    There should be a ground wire at the back of the engine on the passenger side. I'd start by cleaning that ground.
     
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  4. Will L.

    Will L. Well-Known Member

    7,406
    6,008
    Jan 25, 2013
    Boulder City Nv
    Welcome.

    That is 2nd gear “limp” mode. Should be it resets every time you restart the engine. Mine did it on and off for a while, if I downshifted when stopping it wouldn’t happen. Turned out for me that when I was doing a trans filter swap, I pinched the wires inside the trans. Examine the transmission wiring harness closely, chaffing will ground out on outside of trans and cause same issue.
     
    Jaryd and MrMarty51 like this.
  5. MrMarty51

    MrMarty51 Well-Known Member

    1,231
    1,094
    Aug 1, 2017
    Miles City, Montana
    Welcome to the forum Matthew.
     
    Jaryd likes this.
  6. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,978
    2,306
    May 9, 2008
    ZEPHYRHILLS FL
    As said above, 2nd gear only is limp mode. I'm not sure if you need a scanner to read codes or not since it's only a trans controller and a ECM, i don't recall if theres even a service engine light or not for 91-93 4l80e equipped diesel trucks. You could have a loss of power to the trans or controller, bad ground, poor connection at the trans plug, TPS, temp sensor, speed sensor, and so on. You gotta find out what its seeing to go furthur with it.
     

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