Nixon55:
I want to share my experience with "Check VSC System Warning" that came on my dashboard about a week ago. I noticed that the warning Check VSC System came up while driving one day. I used my Obd2 scanner and ran the diagnosis and it came up with the code P0306, Cylinder 6 misfire detected and a check engine illuminated afterwards. Car would jerk while idling and would hesistate while speeding off. After careful study I narrowed the fault to possibly bad spark plugs. I learnt that the engine disables the VSC System when it starts loosing power.
I went ahead to change the spark plugs. Now that is the interesting part; the plugs for the 2.4L 4cyl engine is different from the ones for the 3.5L 6cyl engine. The right plugs are FH20KR-11 and it was quite a challenge finding it. I got it and changed all the six plugs and cleared the codes. I drove for about 2km and the check engine light came up again together with the check VSC System warning. I got home and scanned the car again, this time around it came up with P0356, Ignition Coil 6 Primary/Secondary Circuit. I went ahead to replace the ignition coil on cylinder 6.
After changing the ignition coil and clearing the codes i decided to test drive my car and it came back to life, full 268hp V6 power. It was quite an experience!!

@OP how much did you get the ignition coil and where please. I have same issue on my 07 XLE