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2010 GMC Sierra 2500 HD Question: My truck is stuck in high gear. Any suggestions why?

 

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Lintras, Grand Isle, ME, February 27, 2014, 16:50
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My truck is a 2010 GMC Silverado 2500 series HD . I would like to know some reasons why the truck is stuck in high gear.

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    G. T. Service Center (4188 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG February 27, 2014, 20:10
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    Is there any codes in the ECM and/or TCM. Post the codes that we might help. Possible convertor locked up.

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