i have had this truck for 2 years with no problems. this summer the light will come one @ the start up and stay on. I can cut it off and start it back up and somtimes it will be normal and somtimes it will revert to the service light. it has never cut off going down the road on @ start up. I fugured it was a sensor or short somewhere but i don't want to get screwed over by the dealer ship. anybody have and suggestions?

If you can have the OBD codes scanned, we may help.