do i need to reprogram my 2005 volvo xc 90 2.5t when i change the engine?

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The timing belt of my 2005 volvo xc90 broke at 195 thousand miles and messed up my 2.5T engine so I had to replace the engine.The new fairly used engine is running very well but now the transmission seems to have a problem ; it will not select the gear. Some diagnosis have been done but there seem to be any visible problem to be solved. Could it be a programming problem or has my transmission finally packed up?