i have a 99 gmc yukon, we can start the car in park but will not shift

[fairydust5668]

into any gear, if we turn the key back? to off and put the shifter into nuetral we can start it and shift it into any gear. why cant i shift it from park? what is wrong!? Thanks

 

[Ted]

OK:1999 Yukon has a switch on brake peddle,Take to dealer and have them scan the computer,if computer says bad switch change it your self easy to do.

 

[Nomadd]

The interlock works off the brake light circuit. Check to see if the brake lights are working.

 

[rotus]

Could be the brake-shift lock. Normally, you should not be able to shift the car out of park unless it is running and you are depressing the brake pedal. There may also be a shift lock release. Check your manual.