A friend of mine has a 2008 chevy impala and it is stuck in park

no power - charge the battery

key stuck - foot on brake, rack the shifter though everything and back to Park.

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It's probably your park solenoid. It is located underneath the shifter, it kind of hard to get at, but if your handy you can do it. the part cost about $70 to $80. You may have to get the part at a Chevy dealer.

Check for a blown fuse or the switch behind your brake pedal has gone bad .

the shift lever solenoid is going bad, you didnt mention if it was a column shifter lever or console shifter so i cant tell you how to bypass it, same problem with my chevy,hope this helps, you may need to get this done by a dealer or honest mechanic, if you can find 1, but im sure it will help you out if you look like you know what your talking about, im sure this is your problem! good luck

These cars have a shifter lock that is integrated with your brake pedal. The solenoid should release when your pedal is depressed.Check to make sure your fuses are good first.

My 2007 Impala LTZ was stuck in Park. After trying several alternatives, I pressed the traction control button and the shift lever then worked.

turn key too acc. push brake and try too shift

This is a chevy thing, You must if you can park on flat service, you Must step on the brake pedal hard and muscle the thing out of park.

When you turn ignition on it releases a cable that is attached to the shifter also the shifter has a solenoid attached to it that is released when you step on the brake. Both times that I had the problem of button stuck and cant shift out of park the solenoid was sticking and wouldnt release .