2005 Chevrolet TrailBlazer - Trans help

i have a 2005 chevy trail blazer i bought from a guy and he said it stopped shifting through the gear,s it stay in low gear no matter what gear you put it in except reverse that work,s fine the dealer told him to change the sensor,s in the tranny and it would be fine he done that and it still didn,t help i,m wondering if it need,s to be flashed anyone got any idea,s if so it would be appreciated

It was like this when you bought it ? Well , I don’t understand that but it appears that you are in the market for a rebuilt transmission . So I hope you got this thing cheap.

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