P0410 Code - 2005 4.2 Trailblazer - Chevrolet Forum - Chevy Enthusiasts Forums

P0410 Code - 2005 4.2 Trailblazer

jbi's Avatar
CF Beginner

Join Date: Jun 2010
Posts: 2

June 14th, 2010, 8:43 PM   #1  
P0410 Code - 2005 4.2 Trailblazer

I am having issues with this code. It keeps kicking the check engine light on and off. I have had the pump checked out and there is no water present. Hooked up power to valve and it clicks like it should.

Any other ideas that it could be? The light will come on for several days at times and then will clear it self. Then the light will come on for couple days and go off by its self.

Any help would be much appreciated.

Ear Mountain's Avatar
CF Beginner

Join Date: Apr 2010
Posts: 28

June 16th, 2010, 11:19 AM   #2  
I have a 2005 TB and also had a 4010 code. My story is in another thread on this forum here: Secondary Air Injection Pump

If there was no water in the line down by the pump then the check valve on the engine exhaust manifold is either working correctly or it is stuck closed. My check valve was stuck open and the hose had plenty of water.

The other problem could be the pump itself. Since you are getting intermittent codes that clear themselves your pump may either be working intermittently or it may not be putting enough pressure into the hose.

While you're at it make sure both hoses are connected securely and that there are no defects like kinks, cracks or breaks. An open hose connection or break in the line from the pump to the check valve would be the same as if the pump was not providing full pressure.

I pulled the pump and put power to it and discovered it was not running at full speed. It also had some "gunk" in it.

I ended up replacing the check valve (since I knew it was bad) first. When the code came back I replaced the pump. The code cleared after the next cold engine start and has not returned.

Replacing either the check valve or pump is easy. You will need to raise the vehicle some to work on the pump. BTW I bought a new pump via the AC-Delco website and got a price lower than my dealer and local parts store.

Last edited by Ear Mountain; June 16th, 2010 at 11:23 AM.
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