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H3 code p0503 transmission shifting abruptly between 1st and 2nd

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transmission shifting abruptly between 1st and second gear in heavy traffic .. got code P0503 could this be the problem ,.. if the speed sensor "A "is intermittent as described and erratic high ...where is it located for changing ..thx

Vehicle: 2007 hummer automatic trans. 5 cyl .in line

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