Before you get overly concerned, that noise might be normal. Can you hear it from inside the car with the windows rolled up? If it only lasts a few seconds, it's not due to something rubbing like the wires on the socket. You may be hearing a solenoid activating. I'm much more familiar with Chrysler's computer-controlled transmission. They were the first to have that in '89. They make a ratcheting or buzzing noise when placed into "drive" or "reverse", and when slowing to a stop. One of the shift solenoids cycles on and off dozens of times per second rather than simply switching on or off. That's called "pulse-width modulation". While the valve turns on completely, then off completely very rapidly, the overall average is to allow fluid flow and pressure to build up relatively slowly. That produces a cushioned engagement for comfort.
You may also be hearing a pressure relief valve opening up. With increased engine speed, the transmission's pump is running faster and the increased flow can allow fluid pressure to build up faster than it leaks out of the normal places. That pressure may need to be limited, again, for comfort when a gear is engaged.
I wouldn't lose any sleep over this until you have a chance to drive the car.
Tuesday, October 28th, 2014 AT 11:53 PM