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    payasa14's Avatar
    payasa14 Posts: 74, Reputation: 1
    Junior Member
    		  
    #1

    Dec 21, 2008, 10:14 PM
    Service Engine Soon Light Is On
    I have a 2001 GMC Envoy. The service engine soon ome on and Im going out of town tomorrow. Is it safe to keep driving? Im driving about 3 hours and then 3 hours to get back. What does SES mean? What causes it to come on?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Dec 21, 2008, 11:04 PM

    Stupid reason: You left your fuel cap off.

    It can cause all sorts of driveability problems and poor gas miliage. Jut had a MIL lamp come on today. The car was bucking occaisionally. A dirty sensor.

    Unfortunately, it could be nearly ANYTHING.

    Autozone scans for free and it takes a few minutes. Only then can you make an assessment.
    this8384's Avatar
    this8384 Posts: 4,564, Reputation: 485
    Ultra Member
    		  
    #3

    Dec 22, 2008, 09:14 AM

    Agree with KISS, get a scan done to rule out anything major. If it's something minimal like an emissions code, go ahead with your trip.
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #4

    Dec 23, 2008, 08:39 PM

    Generally speaking, if you're not experiencing any noticeable drivability symptoms, i.e.: bucking, skipping, surging, etc, the light is on for an evaporative emissions fault.
    That means that performance won't be lost but just a tiny bit of gas mileage.

    Remember, the check engine light doesn't care about how your car runs, just how much it pollutes.
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