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View Full Version : Service Engine Soon Light Is On


payasa14
Dec 21, 2008, 10:14 PM
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
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
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
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.