Mechanics

CHEVY VIBRATION/ DIGNOSTIC CODE P0440

1999 Chevrolet Malibu

Tires and Wheels problem
1999 Chevy Malibu 6 cyl Front Wheel Drive Automatic

My question is, since changing my brakes, which was about 3weeks ago. As I travel at higher speeds mostly occurs at about 75mph, I have a vibration in my steering wheel. My car doesn't wobble, shake or make any noise while driving but it is enough vibration for myself to notice and know something is not correct. What could be causing this?
Also I ran a diagnostics check of my car today and came back with a code P0440 which is TWC System low efficiency, looking thru my manual I cannot find anything about this code. Do u have an answer of what casued the code and how to remove it? I hope you have the answers I need, if my questions get answered, I thank you now.
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Jase25
August 1, 2009.



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