My 2000 GTP would not shift out of park. I had just replaced the battery to solve a problem of the key being stuck in the ignition (and failure to start). With the new battery, it would start but not shift out of park. I tried the shift lock release and BTSI fuse with no luck. I tried moving the shifter around as I pressed the shifter button (and brake pedal) and it didn't help. I popped up the center console cover to get to the wiring and shift lock release, but I could not remove the cover because you need to shift to neutral to get it off. I could feel around and see some of the wires, but I couldn't really check the connections or the solenoid. I gave up and called my mechanic. He went under the hood and put the car in drive manually to get it to the shop. He was about to give up too, then he found the problem. The shifter knob wasn't all the way down. It seems the clip that should hold the knob in place wasn't. He bent the clip to make it fit tighter and I haven't had a problem since. So if your shifter is stuck in park, make sure the knob is down all the way before trying something more involved (and expensive).