I Can\'t Take It Anymore.... …I need HELP!!!!! My brake light is staying on, speedometer is wigging out and every now & then the service engine light comes on (mostly when going down hill). I had my friend check it out, who works for a Chevy dealer, and he said it was the speed motion sensor. So I got a new one changed it out and that lasted for about 10 minutes. The brake light stayed off for the 10 min but the speedometer was still on the fritz and service engine light still came on. I had this happen before at the beginning of the year changed the part late February and all was well until Sierra Trek. Can anyone help on this?? I would greatly appreciate all the help I can get on this, it is really starting to bug the piss out of me.