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: 89,130 mi (18,000 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, 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.
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, 2007 GMC Envoy, 74,000 mi
Loose cap. Now cap harder to open and shut. Light can still cime on
check engine light is on all the time
Visitor, 2006 GMC Envoy, 18,000 mi
I bought a replacement gas cap from my GMC Dealer - the check engine light still stayed on - then I removed the negative battery cable as someone else suggest here and the problem was fixed, no more check engine light on - I took the negative cable off when engine off and the ignition key in the on position - Good Luck this was driving me nuts!
Visitor, 2009 GMC Envoy, 33,118 mi
The dealership (Martin GMC) ran a system test and found codeP0449(engine light stayed on. They stated they had to replaced evaporator vent(which I doubted). I paid $500.00 for repairs, which I thought was high. Had another mechanic company run a check who stated it could have been the gas cap. The workers at Martin Gmc did not explained the repairs.
At this time I am having problems with the air conditioner, which was supposed to be repaired before my warranty went out- Martin Gmc stated they replaced a part but still the a/c does not work on the lemon 2009 Envoy with 34012 miles- this should not be happening.
The check engine light is on and I changed the gas cap and it is still on