My 2003 volov s80 will not start or gear shift will not move from park. Pressed on the brake and tried to move gear shift...nothing. The iginition will turn enough to start the radio and ac but will not turn any further to crank the car. Had to get it towed..culd not even put the car in Neutral. What could this be?

SOURCE: V70R will not move from Park

There is a brake pedal switch that is used to tell the car's transmission controller that the brakes are being applied. This allows the parking lock on the lever to be disengaged so you can move the lever back out of park. It's possible that this has failed. The switch is on the "arm" that hangs the pedal down - a dealer can supply you with the switch, and installation is pretty straightforward - just unhook and remove the old one, and put the new one in.

SOURCE: 1999 s80 gear shift sensor

It sounds like the gear selector module is going out. Other than replacing it I don't have much for you. I would take it to a shop you trust and have them run the codes to see if your getting a faulty signal code.

Sorry I can't help more.

SOURCE: 1999 Volvo S80 T6 Shifting Problems

sorry man your problem is your computer detected a problem in your transmission that needs to be open,more likely needs a new set of clutches..........the set is not to expensive but the actual labor is,so good luck.

SOURCE: 1999 Volvo S80 stuck in park

see my friend easy fix,the problem you are having is a wire problem that locks or unlocks the shifter from the park potition and also unlocks the key from the ignition switch is just getting stuck inside the ignition switch, so more likely needs lubrication you can do it yourself or have a machanic do it
for you,maybe replace it with a new one( wich i dont think is nesesary) take it out clean it, put new grease and it should be good to go, good luck.This wire is conected to the ignition switch, on the right side and can be pulled out with your hand.

SOURCE: can not get gear shift into park

your shifter linkage is mis alligned. could have hit it while 4 bying? anyway, look up the info for this procedure or buy the book on it at the parts store. have a partner sit in the car while you adjust to let you know when it is in place. easy fix