Originally Posted by eman0006
Yes I read that thread which is what put me onto the check valve in the first place.
I was just curious because everyone else under the sun pulls a code P0410 and for some reason I have to be different and pull code P0411.
Some additional info, last night when I left work I started my truck and I heard the pump run for about 5 seconds.
With the light reset I went out at lunch today and started my truck, the light did not come on which I assume means the engine was not cool enough. But I had the hose pulled from the check valve and I felt and heard the suction for about 5 seconds then it went away.
Did you get this problem fixed? I have been dealing with the Check Valve issue on my 06 Trailblazer for a while now too.
This seems to be a big issue and it is going to be one of three things. Either your secondary air pump (under the floor of the driver side), the relay for this air pump (next to air pump), and then the check valve which is supposed to open and close on a cold start (engine off for at least 4-6 hours).
I would bet that your check valve needs to be replaced.
The newer trailblazers check valve is more sophisticated than the earlier TBs with this issue. I believe that your check valve now has a pressure sensor that the previous TBs do not.
There is a really good, but long thread about this problem.
I am still working on mine only because I dont have the money to order the check valve yet, but should be doing this soon.
Here is that thread:
I see you are in Eagan, MN. Im in Minneapolis. Ill race you to the nearest junkyard!
If you already fixed this problem, it would be good to hear what you did.