not shifting gears on 1998 Cadillac Seville STS

the serv. eng. soon light came on and the digital speedometer will not show up/ car wont shift through gears. Had the solonoid a and b changed in the transaxle and the vehicle speed sensor. None has worked. any suggestions?

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1 answer
Get the problem diagnosed by an experienced mechanic. Codes are hints as to what is wrong, it takes some investigation to be able to determine the real problem.