Question about Chevrolet TrailBlazer

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I need information and how repair dtc p0411 on chevy trailblazer i like to know how to aproach this one, since is a cjhevy and looks like is a common, on chevy and very tricky to repair, is 4.2 engine i allready repl air pump

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  • leonel alvarado Mar 23, 2011

    corect me if im wrong this for izuzu this is same is chevy cause chevy try to charge me 1,000 dolllars to fix it the site u send me is no for chrvy but mention 4.2 engine i like ur comments

  • leonel alvarado Mar 23, 2011

    no i want answer on chevy not izuzu and is trailblazer 2008 not 2007 i want specific inf, on chevy cause is common on all chevy till 2006 was a tsb not for 2008 what is the fix on new model

  • leonel alvarado Mar 23, 2011


  • leonel alvarado Mar 24, 2011




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Welcome to Fixya

Most of the time, this engine code is related to the secondary air injection system. First thing to check are for cracked or disconnected vacuum lines. The other items that can cause code are the air pump, air pump relay or solenoid valve. The troubleshooting procedure for this code is complicated and may require an experienced auto technician to sort out.

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Posted on Mar 23, 2011

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The error code P0411 (Secondary air injection incorrect upstream flow detected). This is more than likely with the Air injection pump or solenoid.
There is a service bulletin released by the Chevy service center.Its not under a recall, but this problem is faced by many others too. You have to follow the instructions mentioned in the service bulletin to resolve the issue.Click this link to refer the service bulletin:---- ------------- This should help.Thanks.Helpmech.

Posted on Mar 23, 2011


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Maintenance Information

check your owners manual or consult a gm dealer or even look at gm's website i'm sure you will find what you are looking for.

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