Question about 2002 GMC Envoy

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Reduce engine light came on in my 2002 envoy and it feel as if the truck is not getting any power, why is that? the truck slowed down so i pulled over cut it off an started it back up. after starting back up the light came back on it slowed down again.

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Reduced engine power is just like a safe mode. First things first, clean your throttle body. It's possible the butterfly is sticking. Disconnect the battery, clean your throttle body with throttle body cleaner, must be nice and shiny. When finished, drive around for 20 minutes or so with all accessories off. This will allow the computer to relearn a properly functioning throttle body.

Posted on Mar 25, 2011

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1 Answer

What is best diagnostic scanner for 2002 Envoy with ses and reduced engine power lights on?


We have discussed this yesterday--- I believe

You need professional help,not keep asking questions

Only a professional scan tool & checking factory info, to
(learn) about your vehicles Reduced Power issue, will get
to finding a problem

I told you to use the internet, to try & find & learn about it

I may have also told you to stop using it until resolved


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What type of diagnostic scanner is best for 2002 Envoy with SES and Reduced Engine Power lights on?


You need to road test with professional scan tool
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I wouldn't use it,get is diagnosed

Don't need codes present to work on a problem

The answer is most likely already on the internet, if
you make proper use of it with google

Aug 11, 2014 | Cars & Trucks

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Hi William, the engine has a failsafe mode for when it is sick!!>> slowing it down until it is fixed. Cheers Greg.

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Your starter switch is faulty

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