That is normal.
That is a solenoid- that locks the shifter from shifting.
Remember dogs/kids where being left alone in running cars--- and they somehow nudged the shifter into gear-- and the vehicle crashed?
Well if im not mistaken- this is a result of these type of incidents
If the brake pedal is not pressed........ the shifter cant be moved-- even if you press the button on the shifter.
Once you press the brake-- the solenoid released- then you can press the button on shifter (and then you hear a 2nd solenoid) and you can shift.
2013 Equinox LT1 3.6L V6 FWD 88,000
2010 Traverse LT1 3.6L V6 FWD 153,000
2003 Trailblazer LS 4.2L I6 RWD 181,000