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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.

Asked by for the 2010 GMC Sierra 2500 HD
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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Is there any codes in the ECM and/or TCM. Post the codes that we might help. Possible convertor locked up.