I'm familiar with a known issue on the Nissan Titan regarding clicking/popping from the shifters located in the center console. When coming to a stop you can hear a distinct clicking sound.
After researching the site I didn't see an answer regarding this question but there is a known forum topic on this located on Titan Talk dating from 2011, "Brake pedal/gear shift clicking sound" but there isn't a solid solution on the correction.
I didn't see a recall on this issue but I was wondering if an interlock solenoid swap should be made or is there a way to insulate around the area safely to prevent the noise?