Question about 2002 GMC Sierra 2500HD

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02 gmc allison tran. wont go into tow-haul mode

I have an 02 GMC 2500 HD with an allison trans,it just quit going into tow-haul mode......the trans works fine in reg mode

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THERE HAVE BEEN ALOT OF PLOBLEMS WITH THE SHIFTER HANDLE/SWITCH. THE BEST WAY TO VERIFY CONCERN IS USE A DIAG. SCANNER & VIEW TRANSMISSION DATA DISPLAY WHILE ENGINE RUNNING. THE SWITCH IN THE SHIFTER IS FAULTY. IF YOU SEE NO INPUT CHANGE WHILE DEPRESSING SWITCH THIS IS YOUR CONCERN.

Posted on Nov 08, 2008

  • Bill Balk Sep 23, 2013

    I will do that tomorrow thank you very much I appreciate the help

  • Dory
    Dory Jul 04, 2014

    Did this work? I am having similar problem with my '07.

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Posted on Jan 02, 2017

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