Question about 2004 GMC Envoy

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P2176 code my wife went to start the envoy this morning and it started but when she tried to back out the envoy was very sluggish and would hardly move. The engine light came on and she just left it there for the day. When I came home I noticed the gas cap was very loose . I tightened it and drove it around the block with no apparent trouble. I checked the error code and it said P2176. Is the gas cap the problem ?

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  • mbgillman Jan 09, 2009

    Thanks,I'll kepp an eye on it

  • Anonymous Mar 21, 2014

    My gas cap was loose and the check engine soon light went on.
    could this be because of the gas cap?

  • Anonymous Mar 21, 2014

    gas cap was loose and then the check engine soon went on. would the gas cap be the problem?


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NO , gas cap not the issue here . the P2176 refers to throttle actuator control system - idle position not learned .... the test for this is a mile long , i would try clearing the code , and see if it returns , or it will reset itself if it see's 3 drive cycles without a failure . cheers.

Posted on Jan 09, 2009

  • boatsandhoes Sep 10, 2011

    I've replace my gas pedal cleared my code and my idle is still erratic. The local dealer here said to drive it and it will clear it self up. But now I'm getting code p0221 abd p0504. Any ideas. This is ridiculous.


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