06 Cobalt w/engine light..secondary air injection system

[maddawg]

have a 06 Cobalt 2.2 with a engine light that keeps coming back on. code is P0411 and P2440, both related to the Secondary Air Injection System. So far been to a Chevy Dealer 3 times and spent over $800 in repairs. Air Pump, Check Valve w/gasket and Mass Air Flow Sensor have been changed. Any Ideas or advice would be helpful Thanks !!

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[maddawg]

Dealer finally got it right, the air pump they installed failed due to a bad check valve. even with a new pump the check valve was stuck causing the pump to fail. new valve and pump at the same time fixed the problem.

[BHBarr]

I've had the same problem. I bought a 2006 Cobalt new in June 2006. Got the engine light on with code P2440 in June 2008. The check valve was rusted stuck open. Replaced it for $210 parts cost. In March 2009, light came on with codes P0411 and P2440. This time the air pump was rusted frozen. Replaced it for $200 parts cost. In September 2009, engine light came on with code P0411. The check valve was rusted stuck closed. Since stuck closed did not affect drivability, I left it until I failed emission inspection and had to replace it last week for $260 parts cost. I have no suggestions - I think the check valve lets some exhaust leak through, which causes water to condense in the tubes, which in turn leads to rusting of both the valve and the pump.