Does the truck have a self diagnosis tool that can tell me the code for the check engine light? Like some Chrysler /Dodge products if you turn the key 3 times a code will appear on the dash. What about the GMC?
Did u put in fuel shortly before the light came on? I own 2 service centers the most common situation with Check Engine lights are because the fuel cap wasn't re-installed or not tightened. When you refuel make sure it clicks when putting back on. We don't charge for a Code Reading but a dealer will, don't go there. Go, like the others suggested, to Murray's, Auto-zone. If it is the fuel cap you re-install it correctly, the light will go off after a short drive. Good Luck. PS-Don't panic when the Check Engine light comes on unless it blinks, if that happens don't drive. PSS-RE: Murray's, Auto-Zone.If it's a Code (the reader will give a #) the code book will tell you the problem. PSSS-Some1 please have Troy W's Mommy Daddy take away his keyboard. Just because you can put together a Lego car doesn't make you a master mechanic. You only repeated what we said except you have a Napoleon complex against any1 plugging something in to a vehicle. It's the same as plugging in a light home you fool!
The 2002 yukon does not have self diagnosis built into this system.You can call around some of your local auto parts stores and see if any of them have a scanner and will run a free test.Most autozone stores have this service.Best of luck.
