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On my Sierra (1999) I had to do the AIR Pump and the Check Valves. It fixed the codes and never came back. Double check the check valves. Verify you hear the AIR Pump turning on when you start the truck (mine is annoyingly loud inside the cab). Check all the little vacuum lines that go to the system. There is a little vacuum line that comes out of the manifold and runs along the top of the passenger side firewall towards the AIR pump assembly and goes to a little module. Then I think there is a second line that goes to another valve, a break in any of those vacuum lines will cause problems. Ask me how I know, 🙂
Quoted From EricTheCarGuy:
I found this very good article and TSB on this issue you might want to check out.
thanks for the reply Eric,
that article was informative as i shall tackle the issue once my brother-in-law comes back when the S.E.S light returns and follow those guidelines on that article thanks a bunch 🙂Quoted From Third Gear:
On my Sierra (1999) I had to do the AIR Pump and the Check Valves. It fixed the codes and never came back. Double check the check valves. Verify you hear the AIR Pump turning on when you start the truck (mine is annoyingly loud inside the cab). Check all the little vacuum lines that go to the system. There is a little vacuum line that comes out of the manifold and runs along the top of the passenger side firewall towards the AIR pump assembly and goes to a little module. Then I think there is a second line that goes to another valve, a break in any of those vacuum lines will cause problems. Ask me how I know, 🙂
thanks for the reply,
the new air pump works great sounds pretty quiet also inside, i’ll make sure to double check the vacuum lines because i did replace that air vacuum solenoid with a new one but im thinking now if maybe i put the vacuum lines on backwards… but i shall post an update soon, thanks againfirst confirm that the air pump works. it should run when the
truck is started. take the lines apart to see if they are full of
water. also test the check valves by blowing through them
each way.I found this very good article and TSB on this issue you might want to check out.
i wanted to apologize for the late update on this old thread..
but it turns out a small vacuum hose was burnt and brittle causing the air pump to not work effectively thus tripping the P0410 code. after replacing the hose everything works as it should and no more P0410! but thanks for your help and i apologize again for the late updatei wanted to apologize for the late update on this old thread..
but it turns out a small vacuum hose was burnt and brittle causing the air pump to not work effectively thus tripping the P0410 code. after replacing the hose everything works as it should and no more P0410! but thanks for your help and i apologize again for the late update[quote=”reylude” post=32386]i wanted to apologize for the late update on this old thread..
but it turns out a small vacuum hose was burnt and brittle causing the air pump to not work effectively thus tripping the P0410 code. after replacing the hose everything works as it should and no more P0410! but thanks for your help and i apologize again for the late update[/quote]Thanks for updating us with the fix!
[quote=”reylude” post=32386]i wanted to apologize for the late update on this old thread..
but it turns out a small vacuum hose was burnt and brittle causing the air pump to not work effectively thus tripping the P0410 code. after replacing the hose everything works as it should and no more P0410! but thanks for your help and i apologize again for the late update[/quote]Thanks for updating us with the fix!
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