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

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.

by in Grand Isle, ME on February 27, 2014
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1 answer
ANSWER by , February 27, 2014
Is there any codes in the ECM and/or TCM. Post the codes that we might help. Possible convertor locked up.