Car Problem Reports

GMC Envoy Check Engine Light Due to Gas Cap Issue

GMC Envoy Problem
52 Reports
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Model Years Affected: 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

Average Mileage: 89,130 mi (18,000 mi - 197,000 mi)


Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

  • Visitor, , 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.

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  • Visitor, , 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.

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  • Visitor, , 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.

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  • Visitor, , 50,000 mi


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  • Visitor,

    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!

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  • Visitor, , 74,000 mi

    Loose cap. Now cap harder to open and shut. Light can still cime on

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  •  Rookie

    check engine light is on all the time

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  • Visitor, , 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!

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  • Visitor, , 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.

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  • lovely32, , 137,273 mi

    The check engine light is on and I changed the gas cap and it is still on

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