2002 ford escort transmission problem

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vehicle starts and stays in 3rd gear while driving. will not upshift or downshift. park rev and neutral operate normal. the check engine light is not on. there is code P0755 in the memory (shift solenoid B error) koeo and koer tests indicate no problems, all pids in the data stream are normal for a properly running vehicle. i suspect a power or ground problem to the transmission. i was wondering if anyone else out there has experienced a similar problem with one of these cars?