Hi,
I have a 2005 Chevrolet 1/2 ton p/u and my check engine light came on. Question is where do I start with the diagnosis on my truck? And can I reset the light on it also and how?
Thanks

First off u need to get someone to put a computer on it and find out what set the code advance autoparts and auto zone do it for free they will give u a code and u need to take that code and find out what it is and then u can go from their good luck

Have a scan tool or code reader attached to the Data Link Connector under the dash, normally near the steering column, and check for any Diagnostic Trouble Codes (DTCs).
AutoZone will do this for free and will be able to turn the Check Engine Light off.