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2006 387 cruise/transmission issues

Discussion in 'Peterbilt Forum' started by pamlee101, Jan 20, 2014.

  1. Jan 20, 2014 #1
    pamlee101

    pamlee101 Bobtail Member

    1
    0
    Jan 20, 2014
    0
    Hi, I'm here trying to get help for hubby with his truck. He took it to Peterbilt today and they say no codes showing and they have no idea what-so-ever what is wrong. When he has cruise on, hitting the brake does not disengage it. The other problem (we think they are related) is the automatic tranny won't engage with the brake. He has to be able to get it to roll, just a little is all it takes.

    Any ideas on what the problem is and how to fix it? Any help will be greatly appreciated.

    Thanks, pam and Levy
     
    pamlee101, Jan 20, 2014
    pamlee101, Jan 20, 2014
    #1
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  3. Jan 20, 2014 #2
    bjytech

    bjytech Light Load Member

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    Nov 9, 2013
    Ohio
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    Sounds like a brake pedal switch problem, but I would think they would know to check that at a dealer
     
    bjytech, Jan 20, 2014
    bjytech, Jan 20, 2014
    #2
  4. Jan 21, 2014 #3
    JackZ

    JackZ Bobtail Member

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    Jul 7, 2011
    Winston-Salem, NC
    0
    We had a similar problem with our 2006, 387 with an Ultrashift automatic transmission. In that case we had a broken brake signal wire under the cab. That may not be where your problem is but your problem is definitely that the brake signal is not getting to the cruise control or the transmission controller. If they start by checking the brake light switch and then look at the wiring from there back, they should be able to find the problem.
     
    JackZ, Jan 21, 2014
    JackZ, Jan 21, 2014
    #3
  5. Jan 23, 2014 #4
    magoo68

    magoo68 Road Train Member

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    Jun 11, 2011
    st malo mb canada
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    silly question does he have brake lights if not its switch
     
    magoo68, Jan 23, 2014
    magoo68, Jan 23, 2014
    #4
  7. Jan 26, 2014 #5
    1johnb

    1johnb Medium Load Member

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    Jun 13, 2012
    New Paris Ohio
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    1johnb, Jan 26, 2014
    1johnb, Jan 26, 2014
    #5
  8. Jan 26, 2014 #6
    Rockwyrm

    Rockwyrm Bobtail Member

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    Dec 17, 2013
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    What magoo said, blew my fuse on my tractor brake lights, the cruise will not disengage. Fuse panel is under the hood.
     
    Rockwyrm, Jan 26, 2014
    Rockwyrm, Jan 26, 2014
    #6
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