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2013 Chevy Silverado won’t shift from 1-2

  

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My brother has a 2013 Silverado V8 5.3L SEFI;FFV with ~63K miles. Yesterday he was pulling a trailer and when done it won't shift from 1-2 even at 3,500 RPM. I used my INNOVA 5610 scan tool and found no codes. YouTube searches say it could be 1-2 Accumulator? Anyone have any experience with this issue? 

VIN=1GCRKSE73DZ207924

Thanks! 


1 Answer
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https://atracom.blob.core.windows.net/manuals/individual/2013/2013-038.pdf

 


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