
Originally Posted by
oj88
It's the A/T interlock solenoid. For safety reasons, the interlock mechanism prevents you from shifting out of Park without applying the brakes. What you hear is the interlock solenoid unlocking the shift lever when you step on the brake pedal and locking the shift lever again when you release the pedal.
Suffice to say, that's normal.
The interlock system relies on the brake light switch (installed on the brake pedal assembly) to operate properly. If you suddenly cannot shift out of Park even with the brakes applied, check the brake light switch.