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I have a 2002 GMC Envoy, recently the service engine light will blink, usually when accelerating, when I let off of gas it stops. I took it to a mechanic and the computer said that nothing was wrong. They told me that it might have something in the fuel lines or bad gas and it processed it through. I changed the fuel filter and put in fuel injector cleaner, but it still does it. Sometimes it will run fine and others will I start it up it will have a rough vibrating feel. It will also hesitate when I am at a complete stop and take off. Any ideas?

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Blinking service light indicate multiple active faults on the same circuit it could be several things anything from the throtle position sensor to a v.v.t. code if it is a 4.2 liter take it to a dealer or a better qualified mecanic who understands the problems accocited with this engine

Posted on May 11, 2010


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Posted on Jan 02, 2017


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How to reset change oil light in 2002 gmc envoy

On a 2002 Envoy you turn the key to run but don't start it. Then push and release the gas pedal 3 times within 5 seconds. The change engine oil light should blink for 5 seconds meaning you have reset the system. If it doesn't blink for you do the procedure again.

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this model has what they call fly by wire.. no accelerator cable. If the computer detects a problem in the thottle system it will not allow the engine to accelerate and will show reduced power and possibly set a check engine light. The dealer usually wants to replace the throttle assembly which is very expensive and usually un nessesary.
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1 Answer

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Is the service engine light on? If so, take the vehicle to your local Auto Zone and ask them to check your Envoy for trouble codes, write the codes down and reply back to me.
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