Question about 2003 GMC Envoy Xl

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My GMC 2003 Envoy failed smog test because of "the

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The person running the test is an idiot. The OBDII test instrument is not capable of determining if there is a warning lamp failure. It is probably guessing based on voltage level, but lamp resistance does normally vary. The test is supposed to be done visually. Take it to someone else, and they will probably be more competent and pass your car.

Posted on Mar 22, 2011

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It doesn't mean there is something wrong, it is just showing that an error "can" be displayed if an error existed by the light being on. Try it next time. Turn the key on but dont start the engine. If your check engine light is off, then that is what they stated in the report.

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My GMC 2003 Envoy failed smog test because of "the


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Does the light ever come on while you are driving the vehicle? It is possible that the vehicle does not trigger the code on the key cycle when vehicle is connected to the OBDII scan tool (a cycle is the time from when a vehicle is started to the time the vehicle is turned off) you should however most of the time be able to check a vehicles trouble code history to see what may be turning the light on
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I have a 2004 GMC Envoy that has all of a sudden developed a rough idle. It seems to get worse as the engine gets hotter. ie: after driving for 15 minutes . Everything else is fine. Runs great, same gas...


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