Illumination of the Check Engine Light can be caused by a loose or worn gas cap.Google+
Car Problem Reports
GMC Envoy Check Engine Light Due to Gas Cap Issue
GMC Envoy Problem
Average Mileage: 92,053 mi (37,125 mi - 197,000 mi)
Visitor, 2005 GMC Envoy, 58,000 mi
My engine light was on and I checked the gas cap. It was not screwing on prperly and would pull right off. The engine light turned off as soon as I replaced it and started to drive off.
Visitor, 2006 GMC Envoy, 78,256 mi
Check engine light keeps coming on has been checked at dealership. Mechanic said gas cap is causing problem. So off to get a new cap.
Visitor, 2005 GMC Envoy, 50,000 mi
NEW GAS CAP AND DISCONECT THE NEG CABLE ON THE BATTERY TO GET THE LITE OFF
Visitor, 2003 GMC Envoy
BAD FAN CLUTCH! I've had this problem twice. First time at around 60,000 miles. Now again at 228,000 miles. I realize that at 228,000 miles things are going to need replaced or repaired from time to time, but it seems that all of the repairs that I have had to make are repeats of things that I have already repaired peviously. The fan clutch, rotors, linkage, tail-lights & I'm on my third new gas cap. Not to mention that Ozzy Osbourne has been held hostage in the CD player for the last three years! LOL! Actually, I feel like I can't complain too much because given all the miles I've put on my car for the most part it has been a very reliable car. It's never left me stranded anywhere **fingers crossed** and has never felt the cold cruel hook of a tow truck. I will drive it until it falls apart around me because I LOVE IT!
Visitor, 2005 GMC Envoy, 52,000 mi
The check engine light started coming on and I had heard that it could be a problem with the fuel cap. I tried tightening it up when I fueled up and this helped for awhile. Now it stays loose and the light stays on, guess it is the firt vehicle that I've ever owned that had a sensor in the gas cap or a gas cap that didn't fit right. I also found out that this will cause the fuel gauge to work crazy, too.
check engine light is on all the time
Visitor, 2004 GMC Envoy, 130,000 mi
gas cap does not seal, check engine light on. getting a new one
Visitor, 2007 GMC Envoy, 74,000 mi
Loose cap. Now cap harder to open and shut. Light can still cime on
Replaced gas cap
Visitor, 2002 GMC Envoy
The newer gas caps do not fit properly on the older Envoys creating a problem of the check engine light not staying off.....I'm on #4 and check engine light is still on!