Service engine soon on a 2004 gmc envoy?

Answer 1

You can try that what the other person suggested but i own a 2004 GMC Envoy and that could be a number of things mine turned out to to the cam and crank sensor take it and have it hooked to a diagnostic machine (i have one) and ask them what code it throws, it cost of course but its better knowing what the problem is instead of chasing it with different ideas. Try taking your gas cap off and putting it back on again. Otherwise wait til you need gas again. In my 2002 both cleared the problem. If those don't work, rent a code reader from your auto parts store and see what the problem is. Good luck if that don,t work, replace the gas tank cap. they cost about $22.00 .the part that makes the air seal was cracked.they charged me $78.52 parts and labor. there is a stiff plastic retaining strap holding the gas cap that will not let the cap turn easy when you get gas,this was a pain too.