Okay, well I took mine in yesterday and they fixed my seat heaters, power controls for driver seat and a knocking underneath the driver side floor board. (Which I thought might be a tie rod) I take mine to usually a GM Dealer because of the GM Goodwrench service. For the seat problems they had to replace the seat module under my seat and said it had an internal failure. Now both front seat heaters and power controls for driver seat work! That was $562.24 just for labor and parts on that. Boy am I so glad I bought extended warranty when I bought the car last year

They didn't charge me a diagnosis charge because I had the repairs done that needed to be done. As for the knocking, it turned out to be my intermediate steering shaft but he said almost all ppl describe it as the tie rod knocking. That was $170.00 which warranty also covered. Total for oil change and repairs came to $807.98. I paid the $75 ded. for warranty and oil change so total of $116.41 and warranty covered the rest.