P0410 GMC -

Question

I hope I can get some help on this and I apologize if its repetitive. I am new here, PO410 code keeps coming back on my 2004 Trailblazer 4.2, 4 wheel drive 78, 000 miles. I have had the Pump changed part number 215- 454, relay #212-550, and the shut off valve or solenoid as some call it #1257655, yet the light is still on. As well I did a complete fuel injection service thinking it would help get rid of any excess carbon buildup !
Now I have to go back to May of 2014 when this started as I was getting my inspection, they turned the light off "while not finding any codes" so they passed its inspection, I was told No big deal I can let it go even after the light comes back on.. Which the light stayed on a full year. Only to find out in May 2015 that I should have fixed it and due to not repairing it, it caused my pump and others as mentioned to go bad and too much carbon built up. I understand this is just an emissions issue and in California I would not even have this problem. I must also mention back in 2014 they could not come up with any codes.

Now with all the fixs and money I spent the light is back on after 20 miles. After each fix it just keeps coming back on. I have seen in threads that the 02 sensor in the front, not the back can also be the issue ! Yet my mechanic "a new one for me" is saying that the 02 sensor will NOT give me the same code PO410, that if it where the sensor the code will be different. IS THIS A FACT ?

Also he is saying that so much carbon got built up that even after putting in a new Solenoid or shut off valve he cleaned all the carbon everywhere BUT he is saying there is a tube running from the valve into the engine and that is probably the issue, that the head needs to come off to get it thoroughly cleaned of all carbon at that end, and that is the only way to get it. Even after a full injection service!
He said I could just let it go and he will help me pass inspection next year, BUT I am sick of seeing the light.. Is there anything I can do or is he missing other options ?

On a last note I went to my Local Chevy dealer and as to be expected they wanted $225 UPFRONT just to talk to me about it, when all I wanted to do was ask what I am asking here.

I hope this makes sense what I am saying, any help is really greatly appreciated..

Answer 1

Hi there,

This code indicates an issue with the secondary air injection system. Here is a list of possible causes for you.

P0410 GMC - Secondary Air Injection System Malfunction

Read more: https://www.autocodes.com/p0410_gmc.html