what causes reduced engine power light to come on? on 2005 Chevrolet Trailblazer

a whining noise comes from under the hood when the key is turned to acc. sounds to me like it is coming from the throttle body assembly

by in Middletown, OH on August 19, 2012
1 answer
ANSWER by on August 19, 2012
scan eng codes and post so we can adv
Related Items:
I am getting about 8-10 miles/gallon or maybe 180 miles to the tank and I can't figure out why. In the last 2 yrs it has gotten worse. The system is not producing any codes and I don't have any che...
Check engine light comes on, Trailblazer is sputtering and reduced power. Took it to local car parts store to have the code read. Cylinder 5 not firing. Okay, that explains it, but where to star...