I recently have taken my '03 4.2 trailblazer to a check out with my mechanic since the SES light is present for several weeks for now and came out with this code "P0604" and "P0753".

my mechanic mentioned that for the code "P0604" I need to take my tb to the dealer to get it fix since according to him is a computer problem .but he didn't mention how much it will cost, any idea?

also regarding the code P0753 , is this a transmission problem? can be easily fix or it will have to be fix on a shop?:banghead: :2cents:

0753 is a percieved open or short in the trans shift solenoid A circuit. Check this link for 604 http://service.gm.com/gmspo/mode6/pdf/2003/2003file2.pdf