Question about 2004 Buick Rainier

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I have a 2004 buick rainier and i,m getting a code po410

I,ve changed the secondary check valve and i am still getting a code po410

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  • iracurtis May 28, 2009

    wares the pump located at

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P0410 Secondary Air Injection System Malfunction
I am very familiar with this failure code, you are going to have to replace the secondary air injection pump, it has a failed motor in it, the code really indicates no airflow from the pump when commanded to be on.

Posted on May 28, 2009

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Check the fuse before you change the pump. I spend over $300 on a new pump and all needed was a $15 fuse. I think what happens is water gets in the pump and freezes in winter. The pump tries to turn on but is frozen in ice and blows the fuse rendering the whole system useless. Easy way to check is to diconnect a hose from the pump and switch the air conditioning fuse with AIR fuse and start the truck cold. They share the same fuse type. Trust me you know if the pump kicks on, lots of air comes out!

Posted on Jul 08, 2009

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I have a 2004 Buick Rainier with a V8 engine AWD,I got a CARMD CODE READER which is displaying a code C/EV/OOH what do these codes means because my reader will not list the problem when a yellow light


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Secondary air injection check valve


Exactly what the code entitles, the air injection valves that shoot air in the exhaust to help burn excess gasses when the engine warms up the engine when it's cold are malfunctionning. When the engine is cold is just started, it uses what we call a open loop, the engine runs fuel maps and such with a stored program in the ECU that doesnt take in account all the sensors to allow a smooth start and warmup, then after it's warm enough and all, it goes to closed loop using all sensors to lessen the pollution. So when in closed loop, the ECU uses the oxygen sensors to adjust air/fuel ratio, but seeing as how the air injection is possibly jammed open or malfunctionning in some other way and sending air in the exhaust, the sensor think the engine is running lean and injects extra fuel to compensate, but since the reading is false, the engine is actually running rich and making you lose power. Try bypassing the air injection if you want to test this, just find the hose in the exhaust manifold that goes to some black plastic canister type thing and unplug the hose from the canister and find a way to jam it shut so no air can get in. If you sealed it good you should now have full power when the engine has run a while. Hope this helps!

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Code po410


P0410 - Secondary Air Injection System Malfunction
Possible causes- Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

This is likely a pump problem caused by water being sucked into the secondary air injection pump under the hood.

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First of all, 2005 Buick Rainier is equipped with two different engines, 4.2L (VIN code "S") and the 5.3L (VIN code "P"). It would be really nice to know which one we are talking about.

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Engine light came on, code po410 came up.


This has to do with the secondary air pump system, this system is used at cold start-up and involves three components; air pump, solenoid valve and a relay. Many times the valve becomes stuck or clogged, the relay has also been known to fail.

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